Thomas W. Mercer, DDS
Shirley D. Mercer, DDS
Creating Beautiful Smiles
Call: (909)980-5558


Rancho Cucamonga Dental Office – Patient Testimonials

"Outstanding Dental Care" by Happy Patient on February 4, 2011. Both Doctors Thomas and Shirley Mercer are excellent dentists. The atmosphere of their office is comfortable and the dental chairs offer pleasant views of the mountains. The office staff is efficient and friendly. Dr. Thomas and Dr. Shirley have provided great care for many years. Most recently I had a filling replaced, and the results were excellent. I also highly recommend their Invisalign treatment. I now have beautifully straight teeth!

~Happy Patient

I've been going to Dentists Tom and Shirley Mercer for more than 20 years and have always been happy with their work. They are very gentle and when I've had fillings they've been without pain. They seem to keep up with the latest equipment like LASERs. I like the way they match the fillings to my teeth (white fillings). The office staff are very friendly. I recommend them to my friends that need dental work.

~Daryl Daughters

My first appointment with the Doctor Mercer family practice was in July 1986, just two years after they opened their first dental office. Hence, next month will mark twenty three years of continuous dental care. It was a relatively small practice in Riverside, California, but my initial experience was extraordinary; calm, caring and exceptional dentistry. I have never gone to any other dentist since that first visit. Over the years my family grew and my wife and two children went to Dr. Tom and Dr. Shirley for their dental needs. I will never forget my young daughter being extremely afraid of getting a shot of anesthesia. She was so surprised when Dr. Mercer said... "You're all done." She did not even feel the shot.

As my family grew, the Doctor Mercer's family grew, as well as their practice. They opened a new dental office in Rancho Cucamonga and eventually sold their practice in Riverside. I continue to make the drive from Riverside, still today.

Equally important to interject is recognition of the outstanding administrative support staff, dental hygienists and dental assistants. The doctors are blessed to be surrounded by these warm, friendly, professional and competent people.

In conclusion, if you and your family are in need of gentle, quality, exceptional dental care - I encourage you to call the office of Doctors Mercer and Mercer.

Donald Brandt
Riverside, California


I've been going to this dentist (Dr. Thomas) for over 2 years now and I've felt comfortable, informed, and in safe hands here! The staff is VERY friendly and knowledgeable. The office is very clean and well organized but not bland. A good dentist is hard to find, an amazing dentist is almost impossible. But I would recommend this office to anyone and everyone. They are great with kids also.


My name is Debbie McKnight. I have been a patient for 24 years. My situation is a bit different than most. I have had severe health issues for over 27 years which prevent me from having any Novocain while being worked on. I cannot take any medicine for infections, nor can I do most dental work that the average person has done. However, I have been fortunate enough to find a dentist with as much compassion and concern for my health as my own family would have. She has taken the initiative to make herself aware of my fears and concerns and made me feel as comfortable as possible. I feel very privileged to have such a wonderful person in my life. Thank you Dr. Mercer!

by Debbie Mcknight
on February 16, 2011

I've been coming to dr. mercer's for 25 years. You won't find a more friendly dedicated staff anywhere in the area. For gentle, caring, reasonable care give the office a call now. You won't regret it. You will regret it if you put off getting good dental care.
Most Sincerely


"I went to an endodontist and when the doctor looked at my teeth, he said, I'm impresses! Of course I attributed the appearance and care of my teeth to dr Thomas and Shirley mercer DDS. Myse4lf and my family have been patients of their exceptional dental practice for 20 years."

Nancy Westenhaven

"My personal experience with the offices of dr Thomas and Shirley mercer has always been of the upmost quality in dental care. Everyone is very professional and very friendly"

Paul Ramos

"I have been coming to the Mercer's for my dentistry for many years because I'm happy and confident with their treatment. Any questions are answered and explained. Because of this my husband and I travel a long way to see Dr. Tom and Dr. Shirley. We will continue to be patients as long as the practice is open.

Anne Bullock

"I have been coming to this office since the late 90's Their level of service and professionalism has remained throughout all the years. I would recommend them to a friend."

Jeffrey Fittz

Thank you, Dr. Tom, for a surprisingly comfortable dental experience. I have to confess that I have a history of "dental avoidance" and a bit of trepidation seeking treatment--but you and your office have made me feel comfortable. Your work has been pain-free and I have confidence in your able care.

I am so happy to have a dentist home where I feel that I will be well cared for.

Karen Caney

Dental service is always professional and friendly, from receptionist to hygienist to Tom and Shirley. I enthusiastically and whole heartedly recommend the Mercer's Advanced Dentistry!

Daryl Wear

Dr. Thomas & Shirley Mercer have been our Dentist’s since 1996 when we were living in Rancho Cucamonga. We both had various prior experiences with different dentists—some good—some bad, but we were impressed on our first visit and 19 years later we are still driving 100 miles from Oceanside, CA 2-3 times a year to continue our dental treatments with the Mercers.

In 2004 we moved to Oceanside, CA and decided to try out a new dentist in the local area. What a disaster. On our first visit to the new dental office, examinations with X-Rays were completed and we were told that my wife needed to replace 2-3 crowns and to remove and refill 2-3 teeth. My exam was not so severe, but indicated I needed some major work. The office even had a financial consultant to help us with the approximately $5000.00 in proposed treatments. That was a major red flag for us.

My wife was so upset that we immediately made an appointment with the Mercers and informed them of the new dentist findings. Since we had seen them regularly for over 8 years, they reviewed the other dentist recommendations and informed us that we needed no additional treatments. That did it for us. We will be their patients as long as they are in practice.

Over the 19 years with the Mercers, we have both had regular cleanings, fillings, crowns and even one dental implant. Not once have we been dissatisfied with any of these procedures, nor did we feel pressured to have a procedure completed immediately.

If you are looking for a dental team who are extremely professional, competent, honest, and have terrific hygienists and a friendly and helpful office staff—look no further. We give them our highest recommendation!!!!

Gordon Bullock

Mercer Dentistry
9333 Baseline Rd, Suite 200 Rancho Cucamonga, CA 91730
Phone: (909) 980-5558 URL of Map