Patient Reviews

We strive to provide the best possible care and service for our patients. Please leave a review to let us know how we are doing and to share your experience with others.


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Read what other patients have said about us:

Cathy, M

Always an excellent experience!

Allison Miller, Highlands Ranch

We love Dr Sierk and all his staff. They are all awesome and we are so happy we found them!

Jen M., Centennial

First and most incredibly, I cannot overstate how wonderful it is that my kids get EXCITED to see Dr. Jon. We have been visiting Sierk Dentistry since my oldest turned two and my kids actually look forward to their twice annual visits. Crazy! Also importantly, the care is second to none. Dr. Jon was referred to me by our pediatrician and provides thoughtful, personalized and conservative care. We couldn’t be happier.

Bill McMunn, Denver

Excellent care as always !!!!! My daughters always look forward to seeing Dr. Jon and his staff. ????????????????????????????????????????????

Terri Felske, Highlands Ranch

Dr. Jon and staff are so great with my 2-year old. My son is pretty shy around people he doesn’t know very well but they are always super sweet and patient. I’m consistently surprised at what my son allows them to do! This is a very different experience than what I remember as a kid.

Megan M., Lone tree

We brought our young daughter to see Dr. Jon for her first ever dentist appointment. We couldn’t have asked for a more welcoming environment. Everyone made our daughter feel so incredibly comfortable. Kind, thoughtful, caring and very professional.

Jessie S. , Denver

Dr. Sierk and his entire staff are so kind and so patient with my kids. My little ones actually look forward to going to the dentist because everyone is so sweet to them!

Denise S., Centennial

Dr. Sierk is friendly and nice!! Everyone in his office is wonderful! My kids like going to the dentist because it is always such a positive experience for them! They were so good with my 1 year patient and gentle with him, showing him the equipment and letting him play so he wouldn’t be afraid! I’m so happy we found them!

Simone W., Louisville CO

We tried 8 different dentist offices for my daughter who has sensory issues and ASD. This office is the only one that we would ever go to for long-term treatment. Dr. Jon operated on my kid’s teeth at Children’s Hospital because her dental work was too extensive and she too afraid of anyone even touching her teeth. It was an AMAZING experience. This has been two years ago and we saw Dr, Sierk and his team in his office ever since. This is the go to place for your disabled and sensitive, even terrified child. Dr Jon is up to date with and uses the newest technologies in dental care. He is always very patient and takes time to discuss any question. We never feel rushed there. My daughter is ok going there now. We love this place so much that we drive an hour back and forth to see Dr. Jon. Highly recommended.

Dawn l, Lone tree

Dr Jon is the best!!!!

Jamie Slager, Englewood

Amazing experience with my 4 year old son. They took time explaining everything and he had a great time. He did not even realize this was a dr appointment he thought it was a play date with friends. Dr.Jon is so great and his staff is the best around! Thank you for you time and explication.

Amanda M, Highlands Ranch

Wonderful practice. We have been visiting since my child was 1 year old and they have remembered her at every visit. They do a great job of keeping her (now 3) calm and engaged and when that's just impossible they are very patient and understanding with her. They play movies above their chairs and give out tokens at the end that can be used in their gumball-style toy machine. They also give her a goodie bag with toothbrush, paste, stickers, flosses, and a little toy (at least at this age). These things make going to the dentist fun and not scary. In regards to scheduling/billing/ etc. the front desk is competent, positive, and helpful.

Amanda S., Highlands Ranch

Best staff and Dr. Jon is awesome!!!

David N., Parker

My daughter (2 years old) had some discoloration on her front teeth. As a parent you freak out and feel guilty. We then asked friends for recommendations for a dentist. A couple different people suggested Sierk and I couldn't be happier. Dr. Jon was amazing, he walked us through the options and was so kind and gentle with our daughter. This morning was her first real time at the dentist (drills, noise, etc.) and it couldn't have been better. Ashley and the dentist were amazing. My daughter loved the experience and told the other kids at her daycare about seeing the dentist. I almost never write reviews but this was an exceptional experience. Thank you@@@

Hilda, Lone tree

This has been the best experience for our 13 year old son who has sensory processing disorder. He has been a patient for about 6 years and Dr. Sierk and his staff are amazing. We are so grateful to everyone at the office.

Stephanie S. , Littleton

Another super visit. My kids look forward to going to see Dr. John. I always feel so comfortable and really like the personal feedback right after. Such an amazing place!

Kerry M., Castle Rock

Great first experience going to a dentist with our 21 month old. Highly recommend!

Ana, Centennial

My kids loved the staff and office. Everyone is so friendly and helpful. The kids love the environment which is warm and welcoming.

nickif, highlands ranch

I have been binging both my son and daughter to Dr. Sierk since they were about 3 years old. Both my kids and I think Dr. Sierk is wonderful! He takes the time to get to know your kids . He truly cares about your child and as a result, they feel safe and secure. I will continue taking my kids to him. We always have a great experience!

Sharri D. , Highlands Ranch

I couldn’t have asked for a better first experience for my 20 month old son, Paxton. The entire staff is so welcoming and I could tell immediately my son at ease. Ashley was so patient and kind with him, making him very comfortable and she let him see and play with all the dentistry tools they would be using. Dr. Sierk was great! Ashley was able to clean all his teeth and Dr. S gave him a full oral exam. I left with a plan on how to keep his teeth clean and healthy. I am very happy I was referred here and would suggest this practice to anyone with small children.

Han, Highlands Ranch

Very efficient and professional

Anna T, Highlands Ranch

My son actually likes going to the dentist because of Dr. Sierk and his amazing staff! Thank you for always taking such good care of us!

Luci, Denver

Dr. Jon has been my dentist since i was young. He has always been caring and kind to me and makes me love going to the dentist! The staff are wonderful and make getting your teeth cleaned fun. Everyone is always very professional and his office is always pleasant.

Cara Rakovich, Lone Tree

We love this place! I brought my daughter here for her very first appointment. They were so welcoming. They had a board when we arrived that said “Welcome Evelyn”, gave us a tour and introduced us to everyone and did such a great job making my daughter feel comfortable. We are so happy we found Dr. Sierk!

Renee D, Highlands Ranch

My three kids LOVE going to Dr. Jon! I have taken them to this practice for ten years and have had a fantastic experience each visit. Dr. Jon and his team are very caring, professional, and great at taking time to connect with each child. I feel very comfortable trusting Dr. Jon with my children's dental care!

Kara R, Highlands Ranch

We can’t say enough about Dr. Jonathan. He has been a huge part of our journey with a rare genetic disorder. His willingness to research and learn new things has been a tremendous help. The office staff are just as great! We were so lucky to be referred his way 8 years ago.

Jason M, Arvada

All 4 of my kids love going to Dr. Jon for their dental care. He has a natural fun loving way he connects with each one of them. In fact, he is actually kind of a big kid himself!!

Emily V., Parker

We love Dr. Sierk and his staff!! My daughters truly look forward to seeing him. Even my 20 month old allowed her teeth to be cleaned and Dr. Sierk to examine them easily. The staff is friendly, patient and they really care about my children. We feel so lucky to have Dr. Sierk as our dentist!

Vanessa M, Parker

My son had an accident that resulted in removal of a tooth. Dr. Jon and staff were calm, patient, and sweet with my son. He handled the procedure amazingly all due to Dr. Jon and Ashley! I would recommend them over and over again.

Anonymous , Centennial

Dr. Jonathan and his staff are good with kids!!!

Traci Paladini, Highlands Ranch

Dr.Sierks Dentisty is AMAZING! All 3 of my little kids had so much fun! Seriously it was just as easy as taking them to a park. The dental assistant let my 2 year old play with the tools she was going to use so he could feel comfortable and open his mouth. Both my boys at their prior appointment in California would not open their mouth at all, I was so worried but this office had me in tears with how wonderful and welcoming everyone was. I could probably write a page on here but I’ll keep it short and simple- LOVE this dentistry and I wish I could go here too!

April E, Parker

Dr. Sierk and his entire staff are so great! My daughter loves to go and they made my 2 yr old son feel comfortable and safe for his first cleaning. Coukdn’t ask for a better pediatric dentistry!

Barbara H, Lone Tree

We love Dr. Sierk and the entire staff! Our son who is now 13 has been going to Dr. Sierk since he was 4! The best part is that our son is inspired to take great care of his own teeth thanks to the amazing care and encouragement to do so by Dr. Sierk and the hygienists. Thank you!!

Denise S., Centennial

Always a great experience! The staff is friendly and great with kids! Thank you!

Laine Jarvis, Highlands Ranch

The staff and Dentist were all delightful! This was my son's first visit ever to a dentist and they made it a calm and easy experience. Everyone is really great with the kids and showing them exactly what is going to happen so they aren't surprised. I appreciated all the time they took to ease my son's nerves and answer any questions we had. Would highly recommend them!

Anonymous , Aurora

My son loves coming to the dentist. Everyone in the office is warm and friendly. It is a perfect place for a kid's first dentist experience, and then, why go anywhere else? They also do a great job explaining what they see and providing ethical advice.

Nicole Jaime, Highlands Ranch

Dr. Sierk is always welcoming and my son is comfortable every time he is there. Thank you!!

Carissa B. , Centennial

My son is currently 14 and has been going to Sierk Pediatric Dentistry since he was three years old. Dr. Jon and his staff have been excellent with every age along the way! I highly recommend this practice! The environment, the level of patience and professionalism are all top notch.

Kristie S, Highlands Ranch

My kids have been going to Sierk dentistry since they opened. Nothing but good experiences here. Highly recommend this practice!

Jill C., Lone Tree

Always great to see Dr. Jon & his staff! They are the best!

Office Location

  • Highlands Ranch
  • 6660 Timberline Rd #240
  • Highlands Ranch, CO
  • 80130
  • Map & Directions
  • Call: (303) 865-4066