About our Practice

At Prime Endodontics we take pride in offering excellent dental care, leading the pack of the few endodontic practices that are located in the Pacific Northwest. Dr. Nestor Cohenca is one of the most experienced practitioners in Endodontics, Pediatric Endodontics and Dental Traumatology that Washington has to offer. With over 29 years of experience and 10 years as Professor at the University of Washington, you can rest assured that Dr. Cohenca is one of the best options for your endodontic needs. On top of his many years of experience, Dr. Cohenca has also lectured around the world in dentistry and is multilingual speaking English, Spanish, Portuguese, and Hebrew. Apart from his dental practice, he also contributes to his work at Seattle Children’s Hospital.

Why choose our practice

Experience and Care

Dr. Cohenca combines 29 years of clinical experience, patient care and a strong background in academia where he served as Full Tenured Professor conducting research and teaching, nationally and internationally.

Reputation and Education

Dr. Cohenca is amongst the most well-known educators, lecturers and researchers in the field of Endodontics in the world.

Customer care

We are committed to provide our patients and colleagues with the very best service, support, advice and care.


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We Host Continuing Education Events Every Month

We are passionate about Endodontics and enjoy sharing knowledge with the rest of our colleagues in the world of dentistry. Come check out one of our presentations!

Micro Surgery - Apicoectomy

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Root Canal Therapy

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Root Canal Retreatment

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Treatment of Root Resorptions

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Pediatric Endodontics

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Intracoronal Bleaching

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Cracked Teeth

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Treatment of Traumatic injuries

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What our patients are saying...

"Absolutely excellent painless experience, from front began to the end, staff are very professional. Dr. Cohenca did a amazing job. Love it. 5+++ stars!!!"

"I was referred to Prime Endodontics and Doctor Cohenca due to pain after a crown prep procedure. I called on Friday and was able to get a same day appointment. Everyone was extremely welcoming and made for a very relaxing experience. Dr Cohenca did a thorough exam, and then confirmed I needed a r..."

"Excellent, professional care. Would never worry about a problem needing their “fixing” again."

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"I sent a lengthy thank you to the office. This Dr. is beyond excellent!!!!"

"Dr. Cohenca and his staff provided an exceptional experience for me. They were greatly concerned about my comfort and awareness of the procedure. Before it started they gave me a detailed explanation of what to expect. During the procedure Dr. Cohenca continualy checked on how I was doing and ..."

"My first visit with Prime Endodontics definitely didn't leave me disappointed. The level of skill and professionalism is top notch, the office is lovely (sitting by the fire was very soothing), the staff are wonderful and Dr. Cohenca is definitely top notch. Not sure I would say I'm looking f..."

"Prime Endodontics team and Dr. Cohenca are very caring and professional. I had a swelling in my cheek and I have been referred by my dentist to their office. I want to say I had the most amazing root canal - Yes, there is such a thing!! I am now recovering and grateful to the team 🤩🙏👍"

"Recently I was diagnosed with needing a root canal, Prime Endodontics came highly recommended. The office is bright and extremely soothing. Dr. Cohenca was fantastic, he explained the entire procedure and answered all my questions. There was no discomfort during or after and I healed in no time..."

"Dr. Cohenca is clearly highly trained and experienced professional. He explained to me treatment plan in detail, answered all questions, made sure I was comfortable and completed procedure confidently and painlessly. I experienced no complications and felt good after the procedure. I am happy for..."

"Had an emergency root canal needed with severe pain. They got me in quickly and took care of my needs. Will go back if/when needed for another. Highly recommend!"

"I would very much recommend Prime Endodontics to my friends and family. Dr. Cohenca is very patient and friendly to his patients. His assistant is very experienced. The impressive part are; they provided iPad to patient during the treatment, have screen for patients to see everything that doctor ..."

"This was my second time I had to do root canal. Nestor is very gentle, explain before what will happen and what I might feel. During all his treatment it was not paintfull and the next day I felt good. Thank you Nestor for making this experience positive for me."

"I had a very good experience having an infection identified & cleaned out & then a root canal done to clear everything up above an old cap I had on an upper molar. It was a painful toothache & I feel so lucky to have had it taken care of by Dr Cohenca & his whole team. I will feel very comfort..."

"1. Explanation on what the doctor is about to perform was really good 2. RCT procedure was done with great care with detailed explanation 3. I did also like the follow-up which their office done. Usually I haven't seen someone doing it"

"I was SO scared to get a root canal. Everyone in this office was just so amazing and helped me through my nervousness. Dr. Cohenca did an amazing job. So caring and professional. I will be recommending to everyone. 5 star service! Definitely don't put off this procedure. You'll be so glad you got..."

"I was so apprehensive and nervous before going in to see Dr. Cohenca/Prime Endodontics, in Kirkland. The minute I stepped foot in the office, I was made to feel safe and “heard”. My dreaded root canal was amazing and I never felt uncomfortable in the days after. In fact, after the procedure, I we..."

"Dr. Cohenca & his staff responded to my emergency situation by getting me into their office & treating me the same day. Dr. Cohenca is fantastic at his craft & his staff was very professional & pleasant. I would highly recommended them."

"Had to have an emergency root canal and they were very accommodating, thorough, and took great care of me, making sure I understood what was happening during each step of the process"

"He is the best in the world 🌎"

"When you are dealing with infection it pays to find someone you can trust to deliver excellent care, & in my experience you are in exceptional hands with Dr. Cohenca. His credentials are impressive: 29 years of clinical, research & teaching experience, expertise in dental traumatology (when bad t..."

"Amazing! I was referred for molar re-treatment and knew I was in good hands as soon as I walked in the door. The staff are relatable and very professional. Dr. Cohenca is very knowledgeable and accessible. My pain was relieved the same day of treatment. Thank you! If I ever require a root canal I..."

"Dr Cohenca is a wonderful Doctor and took excellent care of me. He doesn’t do a root canal unless it is absolutely necessary and I really appreciated his honesty and care."

"My time at Prime Endodontics was THE most pleasant experience I've had when it comes to endodontics. First off, not only is Dr Cohenca extremely knowledgeable and thorough in his treatment explanation, but his calm and gentle demeanor puts you at ease. In preparation for my retreatment, I had rev..."

"Dr. Cohenca treated my daughter with a root canal. Besides being a fantastic professional he was very patient and attentive to her fear. Explained the course of the procedure and got her full cooperation. Problem was solved with no complications and no after pain. Thank you very much Doctor and w..."

"For having a root canal it was the easiest and painless experience. I actually fell asleep during the procedure. They staff was so good the doctor did a fantastic job"

"Very caring and helpful staff. Dr. Cohenca was excellent! He explained everything along the way and made the RC as comfortable as possible."

"I took my 8 year old to see Dr. Cohenca after a bike crash and damaged tooth that needed a root canal He was WONDERFUL with my child - and I was especially impressed with how careful he was to win trust and gain my child's consent. He insisted that the procedure would only happen if the patient ..."

"Dr. Nestor received me at short notice in light of my urgent request, quickly diagnosed the problem and treated me that day. The treatment was professional and courteous. Doctor Nestor is so gentle and kind. He's just an angel!"

"I highly recommend this orthodontist! I was referred after finding out I needed a root canal and the experience I had was exceptional. From the way I was greeted to the procedure it was a really comfortable and great experience. The staff was very professional and empathetic for their patients. I..."

"We received excellent care for my 13 year old daughter when she had to have root canals on her front 2 teeth. Later she did not believe me when I told her that she had shots to numb the area. This was because Dr.Cohenca and his assistant did not rush through the procedures and they were very conc..."

"Awesome experience. Dr. Cohenca and staff were caring and took extra care to ensure that I was not in pain and that my procedure was as stress free as possible."

"Very patient with me since I was so nervous. Explained the procedure very well and did their best to keep me calm. Very professional. No more pain after my root canal 3 days ago. What a relief."

"Dr. Cohenca and his staff were wonderful with my son during his dental emergency. They told us what was happening in each step of the procedure and made sure he was comfortable with noise-cancelling headphones, music and a blanket. The care they provided made the experience a smooth one. I wou..."

"I saw my regular dentist for extreme pain, she referred me to Kirkland Prime Endodontics for an immediate appointment. Her office called them and they got me in within the hour. That in itself was impressive since I drive to Kirkland from Milton. I went to their office after filling out all infor..."

"I was immediately greeted with a friendly receptionist and was taken right away to see Dr. Cohenca. I must admit, after two previous root canals, it was the best root canal experience I have ever had. Dr. Cohenca was very gentle and kind, explained the entire process and I didn’t feel an iota of ..."

"I was immediately greeted with a friendly receptionist and was taken right away to see Dr. Cohenca. I must admit, it was the best root canal experience I have ever had. Dr. Cohenca was very gentle and kind, explained the entire process and I didn’t feel an iota of pain while he was working on my ..."

"Dr. Cohenca and his staff did an incredible job on my root canal. They were kind and welcoming, explained the procedure clearly and even showed me before and after xrays to illustrate the work that was done. Dr. Cohenca personally called me the next day to see how I was doing. It was a down to ea..."

"The team, lead by Dr. Cohenca, clearly explained what they were going to do. They put me at ease before we got started, and during the procedure they explained their progress. I never experienced pain outside of the brief moments of the initial painkiller injections. When all concluded Dr. Cohe..."

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"My Dentist referred me to Prime. I went in and was evaluated and came back two hours later and received a complete (and painless) root canal and was home with my toothache completely resolved. I was very happy."

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"Recently had root canal therapy.  Dr Cohenca and his staff were exceptional! So very friendly and really showed concern for my care .  Highly recommended!"

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"I just got back from my double root canal with Dr. Cohenca. I was apprehensive, since I hadn't had a root canal in ... 20? years....and these were on my two front teeth. I couldn't have been more pleased w/ the experience! From the person at the front desk, to Stephan and Dr. C--wonderful1 ..."

"Dr. Cohenca was very thorough in his work. I had no pain during or after my root canal. He explains every treatment option specifically designed to you in no rush. He makes his patients feel as though his time is dedicated to their appointment alone, and he is soft spoken, kind and will go the ex..."

"I needed a root canal precedure done, and would like to say it was a very smooth operation by Doctor Cohenca.The Doctor and his staff at Prime were professional, personable and informative. I was able to see the before and after his surgery.I had very little discomfort during my healing.I would r..."

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"I had to have my first root canal taken care of and I found Dr Cohenca after doing some research online. When it comes to dental work I’ve learned the hard way that you must find the perfect fit to make the experience less traumatic and painless. First impressions are everything like they said; I..."

"Needed a last second root canal and Prime Endodontics was amazing.  Dr. Cohenca and his staff are extremely professional and personable; I have never felt so at ease in a dentist office.  I hope I don't need another root canal any time soon, but if I do, I know where I'm going.  Th..."

"I was referred to Dr. Cohenca  through my dentist , unfortunately for a root canal. I have never in my life had this procedure done so I was a little apprehensive and nervous. From the time I entered their beautiful office To the time I left it was an a great experience .The  staff were..."

"I was referred to Dr. Cohenca by my dentist for re treatment of root canal. From customer experience point of view I was treated very well and I felt comfortable. Every detailed was explained to me and I knew exactly how much I will be charged and what kind of work will be done. From technical po..."

"When no one else would see our son due to the closure Dr. Cohneca helped us and made time to not only see but treat him! We are SO THANKFUL for the kindness of Dr. Choneca and staff!!!"

"The entire staff is very professional and show true concern about you as patient! Dental procedures are not fun, but they make you feel at ease and as comfortable as possible. Highly recommend them!"

"I recently went to Dr. Cohenca for a root canal. Initially, I was quite nervous. But Dr Cohenca is a very good doctor. He spent time throughly explaining the procedure. The office was decorated in calming colors and Dr. Cohenca provided earphones so I was able to listen to Claude Debussy the whol..."

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"Good service, able to get help with very short notice and everything was as it should be. I’m a happy customer."

"Dr. Cohenca was recommended for our daughter's root canal, and he did not disappoint! Everyone in the office was fantastic but most importantly the work done was excellent and the whole experience deserves a 5 star rating."

"I had a dental emergency in the midst of “stay at home” and they made a safe and timely space for me.  One root-canal later and all is well.  I was treated well and the procedure was easy and painless.  Highly recommend!"

"I called Dr. Cohenca's office today after enduring a weekend of excruciating pain. They were able to get me in this afternoon, which was such a relief. After locating the offending tooth, Dr. Cohenca thoroughly explained his treatment plan to me. After numbing me up, it was root canal time. It so..."

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"Dr. Cohenca and staff will give you such a good root canal at their sparkling new Market St. location that you'll want to come right away for another!Seriously, what can you say about the unpleasant experience of a root canal except that the doctor and staff made it as humanly pleasant as possibl..."

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"Dr. Cohenca did an emergency root canal for me as a referral from my dentist.  The procedure went very well and I was very impressed with the doctor and the entire staff."

"Dr. Cohenca was wonderful as was the rest of the staff. For someone who doesn’t like the dentist and extreme anxiety, this was probably one of the best experiences I’ve had. Dr. Cohenca walked me through each step to help calm my nerves. Very thankful they were able to get me in quickly!"

" I had a very pleasant experience with Dr. Cohenca and his staff. Mr. Cohenca is very professional, he takes the time to explain what needs to be done and provides valuable advice.I came in for an emergency root canal during a very stressful time for many, but they made sure I felt at ease a..."

"Can I just say, as a colleague and fellow dentist, Dr. Cohenca is exceptional! I refer difficult cases to him and he sends me detailed reports, with X-rays and photographs, unlike most of the specialists I work with. He goes above and beyond to deliver quality care (even during quarantine) with i..."

"Great"

"I just wanted to thank the team that assisted me yesterday. Every effort was made to make me comfortable and the procedure pain-free. I greatly appreciate that I was able to be seen and treated so compassionately during these exceptional times."

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"I sent my dentist an email on a Sunday night about major tooth pain that I was experiencing. The next morning, I was contacted by Karen at Prime Endodontics with an appointment the FOLLOWING DAY! Bridget set me up, Dr. Cohenca performed a root canal flawlessly and without pain, and I even got a c..."

"Amazing Staff and Service.  The staff made me feel comfortable every step of the way.  My procedure was explained well and the staff was more than accommodating. Best dental work I have had."

"I was more than satisfied with my appointment. Everyone was professional and went the extra mile to make sure I was comfortable throughout my procedure. The service was exceptional and I left feeling very happy with the results."

"My daughter had her regular teeth cleaning at our old dentist and they didn't notice she had a cavity. Later we went to a new dentist and was told my daughter's cavity was so deep that she might have to do a root canal. We were referred to Doctor Nestor Cohenca, who's the best doctor we've ever s..."

"I was in pain and was having a hard time finding someone that I felt comfortable with that was able to treat my issue. Dr. Cohenca and his staff made me feel comfortable and confident in him to address my issue. He did a retreatment of one of my former root canals because it showed that it needed..."

"My dentist accidentally drilled too close to a nerve when he was prepping my tooth for a bridge, which caused me to have excruciating pain. They were kind enough to set up an appointment on my behalf with Prime Endodontics. I could not wait for the scheduled appointment and reached out to Prime t..."

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"Very happy with my experience. Warm and relatable staff. Efficient and well-organized, professional operation, too. Dr. Cohenca took the time to make sure he answered my questions and provided full details. I felt very well cared for. And both he and the staff followed up with me after the day of..."

"I had a great experience with Dr. Cohenca. He knew I needed a root canal, he explained the whole procedure and made me feel very comfortable and the procedure went on very smooth. I would like to thank Dr. Cohenca and his team!"

" Saw my dentist and she recommended that I see Dr. Cohenca for a possible root canal.  My dentist called and they could see me that same afternoon.  Dr. Cohenca even scheduled me that next day for the procedure.  I didn't have time to even think about what was going to happene..."

"I got 4 root canals in a 2 week span done here, and I couldn't recommend them more. They got me in quickly for appointments, the staff are nice, respectful, and friendly. The facility is very clean and modern. Dr. Cohenca is very good at what he does, doing the work with minimal pain and utmost c..."

"Had Root Canal and Root Canal Retreatment done across two days. Dr. Cohenca is really experienced, and far better than any previous endodontist I’ve ever dealt with. He is thorough in his work, which can be seen in the x-rays. He makes sure you are getting your money’s worth. You can tell he is a..."

"Prime Endoontics is highly recommended! Dr. Cohenca and staff are very professional and very knowledgeable of their craft. Office is beautiful and all staff makes you feel like your home. My procedure was an emergency case and Dr. Cohenca and staff stepped in and made the procedure painless and q..."

"Prime Endoontics is highly recommended! Dr. Cohenca and staff are very professional and very knowledgeable of their craft.Office is beautiful and all staff makes you feel like your home. My procedure was an emergency case and Dr. Cohenca and staff stepped in and made the procedure painless and qu..."

"I had to get 4 root canals done nearly back to back, this office took every step to make me feel comfortable and ease my dental anxiety for these procedures. Dr. Cohenca and his assistants have very good bedside manner and I would recommend them to anyone. The work was done effectively, quickly, ..."

"I got 4 root canals in a 2 week span done here, and I couldn't recommend them more. They got me in quickly for appointments, the staff are nice, respectful, and friendly. The facility is very clean and modern. Dr. Cohenca is very good at what he does, doing the work with minimal pain and utmost c..."

"Copying my review for him from another site: Had Root Canal and Root Canal Retreatment done across two days. Dr. Cohenca is really experienced, and far better than any previous endodontist I’ve ever dealt with. He is thorough in his work, which can be seen in the x-rays. He makes sure you are get..."

"As one who suffers from anxiety prior to dental treatment, Dr. Cohenca has done a phenomenal job at attending my emotional state while performing the necessary oral treatment. He is quick at responding to emergency situations and putting the patient’s need at the highest priority. The staff at th..."

"Had Root Canal and Root Canal Retreatment done across two days. Dr. Cohenca is really experienced, and far better than any previous endodontist I've ever dealt with. He is thorough in his work, which can be seen in the x-rays. He makes sure you are getting your money's worth. You can tell he is a..."

"As someone who has anxiety before dental treatments, Dr. Cohenca has been extremely attentive to my needs while providing the highest medical care one can expect. He has proven time and again to always respond in emergency situations and place the patient’s priority on top. The staff and office a..."

"After my dentist found a problem under one of my teeth, Dr Cohenca was able to solve the issue. Very friendly and professional staff."

"They were great. My dentist sent me to them and he is picky so right for the bat they had to be good. And yes they are. Took me right in everyone was very nice and helpful. Dr Cohenca checked me out and when to it. Not only that he is a nice guy. Not in pain anymore.  My dentist was right Dr..."

"I can't imagine anyone needing to come here is in a good mood because something is very wrong to have to see an endodontist. With that said, the experience from the first phone call with the receptionist to the dental assistant to Dr. Cohenca is just top notch!! They office is sterile clean (Im t..."

"I highly recommend the Prime Endodontics! Dr. Nestor Cohenca is very professional! He have the highest technology for x rays. It was really a great experience for me today."

"I wrote a much longer review and unfortunately it did not get published so this one will be shorter. Overall, this is the best medial experience my wife and I have ever experienced. Dr Cohenca fit us into his busy schedule, walked us through the results of both CT Scan and XRay so that we could b..."

"The experience was top notch from beginning to end. They were able to see me immediately after my dentist referred me for an emergency root canal. The doctor and staff were all extremely attentive and caring. They understood my dental anxiety and went above and beyond to make sure I was comfortab..."

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"I'm very happy with my experience with Dr. Cohenca, who diagnosed an issue with a sensitive tooth and was able to perform a root canal immediately.The facilities are top-notch, everybody was very attentive and kind, and I actually had a great experience. Highly recommended!"

"Dr. Cohenca and his staff were fantastic! They took their time to explain about my situation, process, and options.   They made sure I was comfortable throughout the procedure  and even called me the next  day to check how I was feeling. Thank you!!!"

"I'm very happy with my experience with Dr. Cohenca, who diagnosed an issue with a sensitive tooth and was able to perform a root canal immediately.The facilities are top-notch, everybody was very attentive and kind, and I actually had a great experience. Highly recommended!"

"I needed to have an emergency root canal and Dr. Cohenca and I had several telephone calls on Easter Sunday to diagnose my symptoms and schedule an appointment for the following morning.  Dr. Cophenca thoroughly explained the procedure and performed it with little to no discomfort.  I c..."

"I sent my dentist an email on a Sunday night about major tooth pain that I was experiencing. The next morning, I was contacted by Karen at Prime Endodontics with an appointment the FOLLOWING DAY! Bridget set me up, Dr. Cohenca performed a root canal flawlessly and without pain, and I even got a c..."

"Pleasant staff, very friendly and helpful.  I changed my previous clinic and was shocked by what could be so good when treating my teeth.  In my opinion, a dental clinic should be just like this."

"Let's be honest....no one wants a root canal.  I, like many others, was not looking forward to the procedure.But from the moment I walked in the door I was treated with amazing care and the overall experience was unbelievable.The staff was kind, the Dr helped me understand the procedure, and..."

" Had I known root canals could so painless and comfortable I wouldn't have suffered for over a year with a cracked tooth. Dr. Cohenca and his staff really took the time to ensure I was comfortable and understood the procedure. The entire process took only about an hour and a half and Dr. Coh..."

"Very professional. Pain free appointment. He made sure that I was comfortable thruought the procedure."

"Dr. Cohenca is a superior endodontist and one of the most compassionate individuals you will ever meet. His root canals are pain free, and he and his staff treat patients with the utmost respect. While there are multiple endodontists in my immediate vicinity, I will willingly drive 30+ miles to E..."

"Dr. Cohenca and the entire staff at Lakeside Endodontics are outstanding! Dr. Cohenca is an expert at what he does and treats his patients with respect, consideration and professionalism. He runs a superior practice -- where patient comfort, satisfaction and excellence take precedence. .A++"

"Excellent and pain free"

Our Memberships

1029 Market St Suite 102
Kirkland, 98033

Prime Endodontics

1029 Market St Suite 102

Tel: (425) 440-2000

Mob: (5.7) 37.-9016

MON - TUE : 7:30 am - 4:00 pm

WED : Closed

THU : 7:30 am - 4:00 pm

FRI : 7:30 am - 2:00 pm

SAT - SUN : Closed