Our Team

At the core of our dental practice is a friendly team of professionals that are dedicated to your utmost comfort and optimal oral health. We view each patient as a unique individual, and tailor each treatment to your specific needs. As part of our commitment to providing close, personalized attention to every patient, we want to encourage patient communication. Please know that we are here to provide outstanding patient care, and that we value the trust you have placed in us.

Dr. Pat Prendergast

Credentials: Doctor of Dental Surgery (D.D.S.)

Dr. Pat Prendergast grew up in the Sandhills of Nebraska, vacationing each summer in the land that would be his eventual home. After attending the University of Notre Dame, he completed his education at Creighton University, graduating with a DDS degree in 1982. He and his spouse Janie soon moved to Denver and began their private practice career. They have enjoyed the Rocky Mountain region in many ways while raising a family and making this area their home. They remain actively involved in constant education to improve their skills, many charities and their church. His practice of dentistry is governed by that simple concept of treating your patients as you would treat your family.

For his entire career, Dr. Prendergast has been a member of the local, state, and national dental societies. He has served the public by working on various committees, councils, special projects within those societies. His longest service was in the area of Public Relations/Peer Review, where he chaired the state level council for this important service to consumers. He has presented table clinics, demonstrations, and been a spokesperson for Biolase Technologies, teaching the use and incorporation of laser technology into dental practices in the Rocky Mountain region. He has participated in dental mission trips to Juarez, Mexico, and remains actively involved with many charities providing pro bono dental care to patients, including the Colorado Mission of Mercy, Foundation for Dentistry for the Handicapped, Stout Street Program, and Smile Again Program. He is currently a board member for the Metropolitan Denver Dental Foundation, the sponsor of the Smile Again Program which restores healthy smiles to victims of domestic abuse.

Dr. Prendergast remains committed to sharing his knowledge, talents, and resources with our community and world. His life away from dentistry centers on family, friends, fishing, learning, and traveling.

Dr. Hammad Zaheer


Dr. Zaheer grew up in Aurora, Colorado where he attended middle school, and high school. He received his B.S. in Biology from the University of Colorado, Denver, and was excited to attend the University of Colorado, School of Dental Medicine for dental school. He graduated in 2018 and has been practicing in Colorado since. As someone who has spent a lot of time in Colorado, he is excited to be able to serve the communities he grew up near.

Dr. Zaheer enjoys building relationships with his patients as well as providing excellent care to his patients. Patients would describe him as easygoing, and having a gentle touch with his dental care. In his free time, he enjoys fitness, photography, and spending time with his family. 

Janie Prendergast

Front Office

Janie has been working with Advanced Dental Health since 1982. Most of her office duties are devoted to the managerial side of this practice. She is our 24/7 I.T. troubleshooter, but can often be found enjoying a conversation with the many clients she has come to know so well over these years. She has a zest for life that comes through in everything she tackles. In her spare time, she enjoys spending time with her husband, their granddaughter and family. 


Dental Hygienist

Michelle Ledebuhr is from East Lansing, Michigan and graduated as a dental hygienist from Ferris State University in 2009. But don’t let her love for Michigan State sway you away from her passion for dentistry.  As a hygienist, Michelle brings her Midwest experience to the comfort of Colorado’s adventure. She focuses on overall health prevention and building relationships with patients. In her spare time she enjoys doing anything outdoors, cooking, skiing, running, volunteering, continuing her education, and spending time with her family.


Dental Hygienist

Shanna has been a hygienist since 2009. She graduated from Colorado Northwestern with a dental hygiene license and continued to Oregon Institute of Technology for her bachelor’s degree in Dental Hygiene.

Shanna has lived in Castle Rock since 2000. She has two amazing girls that keep her on her toes 24/7. They enjoy going to the Renaissance Faire, acrylic painting, and rockhounding. 



Front Office

 Hayley has been in Dentistry for over 12 years. She was born in Texas but raised in Highlands Ranch. She set out to be a Dental Hygienist in college, but her love of art sent her in a different direction, and she graduated from Oklahoma Christian University with a degree in Graphic Design.

Her roles in the dental office have ranged from Sterile Tech, Hygiene Coordinator, Human Resource Manager, and Office Manager. Her favorite part about dentistry is the relationships she gets to build with the patients. She truly believes that dentistry can changes lives, and she strives to take the very best care of each and every patient. 


Front Desk

Marissa is a Colorado native, raised on a ranch in southern Colorado. She has been in the dental field since 2013 and has worked many years as an assistant, until transitioning to the front office for the past 7 years. Marissa and her spouse love to take full advantage of Colorado by hiking, camping, biking, snowboarding and paddle boarding, all while taking their rescue dog along.


Dental Assistant

Alana grew up in Wisconsin and Texas before her husband and pup moved to Colorado in 2020, before the Pandemic! She has been in dentistry for over 5 years and loves being a part of your dental journey. She loves learning new techniques to make your visit as pleasant as possible. If Alana isn’t in the office, you can find her outside enjoying Colorado on a trail! 


Tacoma has been a Colorado resident for over 20 years. She graduated from the Academy of Dental Assisting in 2019. She has been in the dental health profession for over 5 years. She has worked in both the dental lab and dental office during her career. She enjoys being a part of a team that brings health and smiles to their patients. She stays active by walking and playing with her two Shih Tzu puppies.