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:

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!

Dawnette Dobrick, Elbert

Our boys have seen Dr Sierk since we move to Colorado 9 years ago. They are now 13 & 16 and still live having him as their dentist!! HE IS AMAZING!!! We drive almost an hour to see him because he’s THE BEST!!!

Kristen Menzel, Highlands Ranch

Dr. Jon and team are the best! They provide exceptional care and always make the kids feel comfortable.


Dr. Jon is amazing with the kids. His staff is very friendly and makes our children like, (yes, I said like), going to the dentist. I wish they had a "Dr. Jon" when I was growing up... Highly recommend him.

Wendy F, Highlands Ranch

Always a great experience!

Yelena Lisser, Highlands Ranch

Wonderful staff! Very knowledgeable, patient and compassionate. Took their time explaining all the procedures, and were very sweet with both my kiddos. Great experience!

Kristen D., Highlands Ranch

We have had nothing but great experiences here. Dr. Sierk has been our kids' dentist since he opened his practice and we wouldn't even consider going anywhere else. We have had our share of dental emergencies through the years, and Dr. Sierk and his staff have always gotten us in quickly for treatment and administered the best possible care. Our kids have never been afraid of the dentist or dental procedures thanks to Dr. Sierk's amazing bedside manner and the compassion of his staff.

Derek S., Commerce City

You won't find a staff or Pediatric Dentist who has genuine sincerity behind their work with kids. They truly care about families and build positive relationships with their clients. Overall, we are extremely happy with the level of professionalism, care, concern & knowledge of the staff at Sierk Pediatric Dentistry.

Tia T, Highlands Ranch

Dr. Sierk and his team are great. My kids love to go every time!

Bryana M, Lone Tree

I am so thankful to have found Dr. Sierk and his staff. All three of my kiddos were seen at the same time and I was amazed at the patience, ease, kindness and personal care they showed each of my children on an individual basis. I walked away from our appointment encouraged and elated over how well it all went. Thank you Sierk Dentisty for taking such good care of us!

Karissa K. , Parker

We love Dr. Jon & his team! He is so patient with my 3 children when they were nervous about having dental work done. He explained everything he was going to do before he did it. They felt very at ease and were given pelntly of time to ask their questions. The whole team is wonderful & we’d whole heartedly recommend them!

Kara, Littleton

All around an awesome experience!!

Sarah R. , Highlands Ranch

We have been going to Dr. Sierk for close to 6 years. We couldn’t be happier with this practice. My 8 yr old daughter had to have 2 baby teeth pulled today and they made it so easy. She and I were both very nervous but we were taken back to get started immediately (no waiting=less time to get scared!) and she felt no pain. They are always prompt and kind whenever we go in for general cleanings. My kids love going to the dentist! Thank you all for making this a wonderful experience for them!

Kristin M , Lone tree

Great staff. Wonderful experience for my daughter! Thank you so much for taking the time to explain things to her.

Phil G, Castle Rock

Always a great experience

Office Location

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