Great White Dental works to provide high quality dentistry in San Antonio, Texas — all within a comfortable and friendly atmosphere. Our dentists and team are dedicated to providing our patients with an excellent experience and the highest possible quality of care. Your oral health, smile and comfort are our highest priorities, and we go above and beyond to make sure that your needs are met and that you achieve the results you desire. Meet with our office, including our dentists, Dr. Alejandro Martinez and Dr. Sarah McMahan, and see how they can get you great care you can count on. Reach out to our office today for an appointment.

Staff Photo
Alejandro Martinez, DDS
Since 2012, Dr. Alejandro Martinez has been providing comprehensive dentistry in San Antonio, Texas. He graduated dental school from University of Texas Health Science Center at San Antonio. He is a member of ADA, Spear Education, Academy of General Dentistry, San Antonio Dental District Society, American Academy of Cosmetic Dentistry and Texas Dental Association. Dr. Alejandro Martinez obtained a Fellowship at the California Implant Institute. He also won the Opencare Patients’ Choice Award. Dr. Martinez has received advanced training in cosmetic dentistry, surgical implant placement and implant restorations and dental extractions including impacted wisdom teeth.Outside practicing dentistry, Dr. Martinez enjoys spending time with his Siberian Husky, Meeka, playing guitar, and any outdoor adventures like hiking, mountain biking, snow skiing, wakeboarding and camping.

His goal as a dentist is to continually improve and evolve as a dentist, giving our patients the best care possible while also providing knowledge to patients about their oral health and proper way to take care of their teeth and gums.

Sarah McMahan, DDS
Dr. Sarah McMahan has been practicing in San Antonio, Texas, since 2015. She graduated with her degree in dentistry at the University of Texas Health Science Center at San Antonio in 2015. She completed her undergraduate studies at University of Texas Austin with a bachelor’s degree in economics in 2010. Dr. McMahan is a member of the ADA and Academy of General Dentistry.

In her free time, Dr. Sarah McMahan enjoys gardening, yoga, playing with her dogs, watching University of Texas football and watching the Spurs.

Kimberly Villanueva — Dental Hygienist
Kim got her Bachelor of Science in dental hygiene at the University of Texas Health Science Center at San Antonio and has been in dental care for seven years. Kim cares about providing quality care specific to each patient’s needs. Kim enjoys socializing with friends and family. She also loves being with her fur baby named Kai.

Ashley Cheswick — Registered Dental Assistant
As our dental assistant, Ashley wants the patients to enjoy coming in for their appointment and does everything in her power to achieve that. Ashley is a proud mother of two children, Kolton and Paisley. In her free time, Ashley enjoys baking, spending time with kids, going to concerts and going shopping.

Gracie Maldonado — Registered Dental Assistant
Gracie received her certificate as a registered dental assistant in 2014. She enjoys giving patients their smile back. In her free time, Gracie enjoys traveling, dancing and hanging out with friends.

Crystal Olivares — Office Manager
Crystal has seven years of dental experience and graduated from Kaplan College in 2012. She is committed to making sure that our patients and their families have a positive experience in our practice.

When she isn’t working, Crystal enjoys spending time with her three amazing sons, Evan, Isaiah and Isaac. Crystal is passionate about music and traveling.

Carrie Graf — Office Manager
Carrie started attended San Antonio College of Medical and Dental Assisting, where she was certified to be a registered dental assistant. She worked as an assistant for about 11 years before transitioning to the front office aspect of the dental field. Carrie is a proud mother and grandmother. She enjoys doing outdoor activities like hunting, fishing, shooting, yard work and hanging around a fire with her friends and family.

Alejandro Martinez, DDS

Since 2012, Dr. Alejandro Martinez has been providing comprehensive dentistry in San Antonio, Texas. He graduated dental school from University of Texas Health Science Center at San Antonio. He is a member of ADA, Spear Education, Academy of General Dentistry, San Antonio Dental District Society, American Academy of Cosmetic Dentistry and Texas Dental Association. Dr. Alejandro Martinez obtained a Fellowship at the California Implant Institute. He also won the Opencare Patients’ Choice Award. Dr. Martinez has received advanced training in cosmetic dentistry, surgical implant placement and implant restorations and dental extractions including impacted wisdom teeth.
Outside practicing dentistry, Dr. Martinez enjoys spending time with his Siberian Husky, Meeka, playing guitar, and any outdoor adventures like hiking, mountain biking, snow skiing, wakeboarding and camping.
His goal as a dentist is to continually improve and evolve as a dentist, giving our patients the best care possible while also providing knowledge to patients about their oral health and proper way to take care of their teeth and gums.

Alejandro Martinez, DDS

Sarah McMahan, DDS

Dr. Sarah McMahan has been practicing in San Antonio, Texas, since 2015. She graduated with her degree in dentistry at the University of Texas Health Science Center at San Antonio in 2015. She completed her undergraduate studies at University of Texas Austin with a bachelor’s degree in economics in 2010. Dr. McMahan is a member of the ADA and Academy of General Dentistry.
In her free time, Dr. Sarah McMahan enjoys gardening, yoga, playing with her dogs, watching University of Texas football and watching the Spurs.

Sarah McMahan, DDS

Kimberly Villanueva, DH

Kim got her Bachelor of Science in dental hygiene at the University of Texas Health Science Center at San Antonio and has been in dental care for seven years. Kim cares about providing quality care specific to each patient’s needs. Kim enjoys socializing with friends and family. She also loves being with her fur baby named Kai.

Kimberly Villanueva

Dental Hygienist

Ashley Cheswick, RDA

As our dental assistant, Ashley wants the patients to enjoy coming in for their appointment and does everything in her power to achieve that. Ashley is a proud mother of two children, Kolton and Paisley. In her free time, Ashley enjoys baking, spending time with kids, going to concerts and going shopping.

Ashley Cheswick

Registered Dental Assistant

Gracie Maldonado, RDA

Gracie received her certificate as a registered dental assistant in 2014. She enjoys giving patients their smile back. In her free time, Gracie enjoys traveling, dancing and hanging out with friends.

Gracie Maldonado

Registered Dental Assistant

Crystal Olivares, OM

Crystal has seven years of dental experience and graduated from Kaplan College in 2012. She is committed to making sure that our patients and their families have a positive experience in our practice.
When she isn’t working, Crystal enjoys spending time with her three amazing sons, Evan, Isaiah and Isaac. Crystal is passionate about music and traveling.

Crystal Olivares

Office Manager

Carrie Graf, OM

Carrie started attended San Antonio College of Medical and Dental Assisting, where she was certified to be a registered dental assistant. She worked as an assistant for about 11 years before transitioning to the front office aspect of the dental field. Carrie is a proud mother and grandmother. She enjoys doing outdoor activities like hunting, fishing, shooting, yard work and hanging around a fire with her friends and family.

Carrie Graf

Office Manager