Dr. Ronald John Caldwell, Jr.

Dr. Ronald J. Caldwell graduated from Colorado State University in 1994 before completing his dental degree at the University of Texas Health Science Center at Houston. He has practiced in the area since 2005. Dr. Caldwell is very active in continuing education and is also a member of the Texas Dental Association and Capital Area Dental Society. As a dentist, Dr. Caldwell strives to treat patients conservatively, effectively, and efficiently with the highest quality in mind.

Outside the office, Dr. Caldwell is an avid hunter and golfer. He also enjoys spending time with his wife, Marnie; his son, Cameron; and his daughters, Kate and Caroline.


Dr. Omid Mehdipour

Dr. Omid Mehdipour earned his Bachelor of Science in biology from San Diego State before he attended the University of California-San Francisco for dentistry. He is a member of the American Dental Association, Texas Dental Association, American Dental Society of Anesthesiology and the Academy of General Dentistry, continuing his educating every three months, and completed a General Practice Residency in Las Vegas. His goal as a dentist is to stay current with new technology and provide minimally invasive care. He has been with Planet Smile since 2016. Dr. Mehdipour participated in a general practice residency expanding his knowledge and experience in CAD/CAM, implant placement/restorations, prosthodontics, endodontics, oral surgery, and sedation dentistry. He also multilingual and speaks English, Swedish and Farsi.

Dr. Mehdipour is married to his wife since 2010. His hobbies include comedy clubs, hiking, and traveling.

Meet Our Team

Our team at Planet Smile is eager to welcome you and your family to our dental office in Pflugerville, Texas! We strive to provide each patient with attentive, gentle, and high-quality service in Spanish or English. Please contact us today to schedule your appointment with our friendly dentists!

Megan – Registered Dental Assistant/Office Manager
Megan moved to Texas from Missouri in 2010 and studied the accredited dental assisting program at the College of Healthcare Professionals in Austin, TX, graduating in 2013. Within one year of practice, she became a certified CAD/CAM digital designer with Planmeca University, specializing in digital same-day restorations, utilizing 3D imaging software, and was training to become an integration specialist. She is currently a dental assistant instructor in Liberty Hills, Texas.

She believes in oral-systemic relation and strives to have every patient informed of the correlation of overall body health and its connection to the mouth. Her standard of care is extremely high, and she values individualized patient care.

With a quick progression in the dental world from assisting to training and designing, Megan is now managing and teaching. She is motivated to share her knowledge with other driven individuals and to build and inspire. Megan has a daughter and has juggled a thriving career path and a beautiful little warrior!


Amy – Treatment/Financial Coordinator
Amy attended the University of New Orleans and has a rich background in customer service. Amy joined Planet Smile in October of 2016. She previously worked in a pediatric dental office as a patient care specialist and an orthodontic office as the treatment plan coordinator. Her current role allows her to create and present dental treatment plans, as well as verify and maintain healthy patient financial ledgers. She loves seeing our patients leave with a smile!


Tarmara – Receptionist/Hygiene Coordinator
Tarmara graduated the dental assisting program in 2009 at Everest Institution, and worked as a registered dental assistant from 2008-2014. She has an extensive background in dental benefits, previously working for Superior Health Plans for 2 years. Tarmara joined Planet Smile in November of 2016. Tarmara’s role at the practice allows her to maintain patient hygiene appointments, verify dental insurance benefits while leaving a lasting impression coordinating a positive experience from initial check in to check out. When not at work, Tarmara’s interests spending time with her family, baking, bedazzling, and cooking.


Cossandra – Registered Dental Hygienist
Cossandra has over 20 years of experience in dental hygiene and has been part of our team since January 2017. She graduated magna cum laude with a Bachelor of Science in dental hygiene in 1997. Cossandra attended Jackson MS and the University of MS Medical Center.


Nelda – Registered Dental Assistant
Nelda has been with Dr. Caldwell since 2015. She has a lot of experience working with children and patient education in the dental field. Nelda is also bi-lingual in Spanish. Nelda graduated from dental assisting school in 2008, taking her courses at UTSA. She loves working with our great doctors at Planet Smile. Nelda is a mother of three and loves to travel and help others—she has been part of a medical mission team volunteering at a dental clinic.


Courttney – Registered Dental Assistant
Courttney recently joined our team at Planet Smile after graduating from the College of Healthcare Professionals in January 2017. She loves the atmosphere and family setting at Planet Smile and appreciates being part of a team who made her feel really comfortable during her externship. Courttney has a three-year-old daughter who wants to be just like her mommy and work in the dental field!