Sierk Children's Dentistry

Sierk Children's Dentistry With practices in Highlands Ranch and Castle Pines, Dr. Jon has been providing caring treatment to th

“My child patients amaze and inspire me and in turn, I strive to serve them with tireless enthusiasm and positivity. I love enjoying each and every day because each day is a gift. It is an honor that parents entrust me with their children’s care. I try to make a personal connection with every child, every time.”
– Dr. Jon Sierk
Dr. Jon Sierk has been serving the children and families of Colorado s

ince completing his pediatric specialty training in 2003. He is proud to be a diplomate of the American Board of Pediatric Dentistry.

04/14/2026

Spring has Sprung! We will be seeing our friends in the upcoming days!

04/07/2026
04/07/2026

“C truly loves him, it’s not just words for a video. John truly changed his perspective on dentists.He is so caring, thoughtful, positive and loving. We appreciate him so much! He truly made a difference and impact on C. Forever grateful!”

Join us as we celebrate 20 years of making friends and treating children in Highlands Ranch!Thank You for being part of ...
04/06/2026

Join us as we celebrate 20 years of making friends and treating children in Highlands Ranch!
Thank You for being part of our journey!

02/14/2026

Our team created “homemade” Valentine’s for each other all week! It was fun, creative and most of all, silly! Happy Valentine’s Day!

01/15/2026

Best day EVER! Our friend was accompanied by her service dog. Ripley brought smiles to everyone’s faces!

12/24/2025

Our team sends Love, Smiles and Warm Wishes to your family this holiday season!

11/16/2025

Happy Birthday Dr. Sierk! Wishing you a day of love and sunshine

10/31/2025

Happy Halloween!

10/25/2025

Come see us for Halloween fun!

10/24/2025

Thank you to our friend for capturing the true essence of Dr. Jon! The likeness is astounding!

Thank you for your service. Thank you for your sacrifice.
05/26/2025

Thank you for your service. Thank you for your sacrifice.

Address

6660 Timberline Road
Highlands Ranch, CO
80130

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 7am - 1pm

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