Our Dental Team

Gregory S. Holbrook, DMD

Or. Holbrook is a husband of 32 years, a father of six kids and recently had his first grandson. He is a leader in his faith and a humanitarian who has shared his dental expertise around the world. He loves his profession as a dentist because he loves helping people. He also loves it because he is an artist and a technician. Because he is detail-oriented and demands perfection from himself. But mostly because his hero was his grandfather - who he watched his whole life - take care of people as a dentist. 

Dr. Holbrook decided to be a dentist when he was 12 years old, and never veered from that path. He knows that your dental health makes a difference in your life whether you've realized it or not. He wants to deliver the best results to you his patient, and he is always concerned about your comfort. He is constantly exploring new options to create a better experience for you. He has overhead TV's in each room and earphones available so you can relax and escape while he does his job. He offers conscious and IV sedation, and other options to help you relax. 

He will always be honest with you. He will tell you what you need - and first and foremost - he will always opt to preserve your natural teeth. Because it's not only healthier for you, it will give you results that last longer. He has 22 years of experience, in which time he learned l) his relationship with you as a patient is valuable to him 2) confidence in your smile is a life changer for everyone 3) comfort is possible even when going to the dentist. He graduated from Oregon Health Sciences University in 1996 with a Doctorate of Dental Medicine. After graduating, he practiced in Idaho for 21 years before moving to Texas. 

Gaby Renenquez – Registered Dental Assistant

My name is Gabrielle Requenez. I was born and raised in Carrollton. I've been in dental for almost 8 years, and I have been with Dr Holbrook for a little over 3 ½ years, I can't see myself anywhere else. I have furthered my knowledge of dental in ways I didn't think I would. I have a beautiful little family that brings me so much joy!

My son Jaxson will be four this year and he keeps us very busy; we enjoy any outside activity we can find and are looking to play baseball soon!

Our favorite place to go is the beach, growing up we would always visit South Padre Island because we have family close by. So, I try and keep the same thing for my family, and we try and hit the beach every summer! 

Julie Costly, RDH, BS – Registered Dental Hygienist

Julie graduated from Texas Woman's University in 2000. She earned a bachelor's degree in health science, graduating with honors, Summa Cum Laude. She has been brightening smiles ever since.

Julie has had the pleasure of working for the same dental practice for over 17 years. She knows and treats her patients like family.

Julie is an avid runner, having qualified for and completed the Boston Marathon twice. She is also a certified yoga and fitness instructor. 

In her spare time, you will finder her spending time at her yoga studio, working out, or enjoying time in the sun.

Connie Crittendon – Health Relationship Coordinator

I was born and raised in Enterprise, Alabama. I have three sisters that live in the Austin Area along with my Parents. I have a son and daughter-in- law that I am blessed to have living here in Lewisville. 

I began working in Dentistry in 1997 when my brother-in-law bought a practice is Lewisville. The knowledge and wisdom he shared is forever with me. When he had to stopped practicing in 2005 the practice merged with Randall Dental Associates. It was then that my bestie Julie and I literally walked one block to our new dental home. 

In my spare time my husband and I enjoy thrift shopping and selling on eBay. We have been together since 1986 and still love hanging out thrifting and of course watching Alabama Football. I also have a craft business where I make Themed gift boxes. I have a small workspace in my son's office. I love that I get to spend a lot of time with him on the weekends while working. 

Miranda Chandler – Office Manager

Miranda is a proud local from Flower Mound who went to Marcus High School and Graduated from NCTC with her dental assisting certification. She lives in Lake Dallas at the present time and has two dogs she adores. She enjoys fishing, boating, soccer, and corn hole. She is a 2 time Punt Pass and Kick National Champion and a lover of all sports.

Come on in and chat it up with her about the latest sports games. 

Beth – Registered Dental Hygienist

Beth graduated as valedictorian from Collin College's dental hygiene program. Additionally, she has a Masters Degree in Kinesiology from Georgia Southern University. Originally from New York state, she moved to Texas in 2008. She is proudly married to a Soldier in the US Army Reserves. They live in Denton with the World's Favorite Boxer named Zeke.

Beth and her husband enjoy spending time outdoors and going to the movies.