Javascript is not enabled on this browser. This site will not function properly if Javascript is not enabled.
Our Mission

Our Mission is simple: To provide you with the finest endodontic treatment available anywhere - delivered in a compassionate and caring environment.


Practice Profile

We are an endodontic (root canal) specialty office.  All of our doctors are specialists - each completing two additional years of specialized training beyond their dental degrees.  All of our equipment is state-of-the-art, reflecting the most current in endodontic technology.  Surgical microscopes in each treatment room help facilitate the most precise results possible.  Our goal is to provide you with the best, most accurate, and thorough diagnosis possible. Fortunately, recent technological breakthroughs have allowed us to make major advances in our ability to achieve that goal. The Cone Beam Computed Tomography (CBCT) (“dental cone beam” or “cone beam”) is a new technology similar to CAT scans in that it will give us a 360 degree 3 dimensional view of the area we are examining.  Our digital x-rays minimize radiation exposure and allow instant consultation and reporting with your general dentist and other specialists.


In keeping with the current direction of health care record keeping, all of our records are electronic, assuring that our doctors have access to your records should you have any problems when the office is not open.  Physical and electronic security measures assure the privacy of your personal data.  If you have dental insurance, your insurance claim can even be billed electronically the day of your visit assuring timely and accurate claims processing.  You can even complete your patient history and insurance registration information online prior to your appointment and check account balance payment information there as well as updating any information down the road.


While having the latest technology is great, we are most proud of our wonderful, compassionate staff.  For many people endodontic therapy can be an anxious experience.  Our doctors and staff are sensitive to that and we have several different methods for helping our anxious patients including preoperative sedation.  We can even schedule to have an anesthesiologist come in to put our most anxious patients completely asleep for the procedure.


Having multiple doctors in the practice assures you of the most experience and the most available appointment times.  Our practice has been serving the Westlake Village and Thousand Oaks area for over 40 years.


So, if you need an endodontic specialist, give us a call.  We would love to meet you.



I had a root canal done by Dr. Bollinger recently. I was extremely pleased with the whole process. Dr. Bollinger is kind, gentle, understanding, and obviously a great specialist. His assistant Lisa is also wonderful in helping me during my two visits (examination/consultation and actual root canal). The office staff is very friendly, capable, and efficient. Overall, it was a very pleasant experience for me.

A. Li

Kudos to Dr. Stoops, Victor, the excellent administrative staff for their outstanding skills, kind care, and attention to detail when I required a challenging root canal recently. Top marks and my sincere appreciation for their excellent assistance! JGS

Jim Schuman

Dr. Bollinger is a true artist. My root canal was painless and efficient. I highly recommend this office.

Douglas Davis

Dr Stoops is thorough and incredibly nice- providing any details I asked. I walked in scared to death and I left the office going to Jamba Juice! Dr Stoops is GOOD ENERGY and talented. I was really bummed that my tooth was falling apart and for the pain- and having to deal with this however I am sure glad I was referred to Dr. Stoops- thank you Sir! I am impressed by what you do. Sure beats the 1800’s! %uD83D%uDE4F

Thank You Dr Stoops!

I had my first root canal ever done by Dr. Bollinger today under oral sedation. It was literally totally painless, the staff is wonderful and the atmosphere relaxed. I even hardly felt the numbing injections. I highly recommend Dr. Bollinger and his wonderful staff!

Inge Nitschmann

Just wanted to thank you for the kind, compassionate atmosphere and personnel in your office.  Starting with the lady on the phone down to the young apprentice who assisted Dr. Cobin.  If at all possible to state ,considering it was a root canal, the experience was tolerable and informative.

I thank you

Conejo-Simi Endodonics
176 Auburn Court, Suite 6
Westlake Village, CA 91362


James E. Bollinger, D.D.S., INC.

Ryan C. Stoops, D.D.S., INC.

Dianna Z. Volk, DDS, MS