Our Staff


Teressa Keith, RDA

Practice Manager

Teressa is a Registered Dental Assistant and began working with Dr. Duffy in 1993 and became her Office Manager in November 1994. She started her career in pediatric dentistry in 1988 after completing a 1 year training course in dental assisting at VTI Academy. Teressa and her husband Robby live in Saginaw, have 3 grown children, Brad, Jennifer and Jessica and new grandson Tristan who was born in April 2009. Robby and Teressa enjoy being grandparents, they also love camping, swimming, and spending time with their family.


    DeAnn Fitch, RDH


    DeAnn is Dr. Duffy’s full time hygienist and has been with the practice since 1996. DeAnn graduated with a Bachelor of Science Degree in Dental Hygiene in 1980 from the University of Louisiana. She lives in Flower Mound with her husband Buddy and has 2 grown daughters, Megan and Morgan.


      Lynn Fisher, RDH


      Lynn joined our practice November of 2007. Lynn graduated from North central Texas College with an Associate of Science in 1996 and Texas Women’s University in 2000 with a Bachelor of Science Degree in Dental Hygiene. Lynn loves working with children and when she is not at our office she is working at another pediatric practice in Plano. Lynn lives in Pilot Point with her husband Ted and their son Cooper. Lynn loves spending time with her family and scrap-booking in her free time.

        Andrea Praesel

        Financial Treatment Coordinator

        Andrea joined our practice in 2001. She started her career in dentistry in 1999 after she completed her 1 year training from Texas State Technical College RDA program. Andrea is our financial/treatment coordinator and on occasions you will see her working with children in the back office. But where ever you see her she loves working with parents in taking care of their children’s needs and teaching children healthy oral hygiene. Andrea lives in Denton with her husband Justin and their 2 daughters. When Andrea is not working she enjoys movies, reading, running and dancing.


          Cori Gentry, RDA

          Clinical Assistant

          Cori joined our team November of 2007. She is a graduate of the North Texas School of Dental Assisting and loves her career in the dental field. Cori currently resides in Flower Mound and enjoys spending time with her family and friends.


            Myra Gutierrez, RDA

            Clinical Assistant

            Myra recently joined our practice in May of 2014. She began her career as a dental assistant in 2010 and loves working with children. Myra lives in Irving with her cat Skylar and she loves to travel and spend time with family and friends.


              Alyssa Loomis, RDA

              Clinical Assistant

              Alyssa joined our practice in May of 2014. Alyssa completed her dental assisting training at Anthem College in 2012. Alyssa enjoys working with children and teaching them good oral hygiene and healthy habits. When Alyssa is not working she loves spending time with her husband and son in outdoor activities and she also enjoys baking sweets! Alyssa and her family currently reside in Lewisville.


                Brigitte Brewer

                New Patient/Insurance Coordinator

                Brigitte joined our practice in June of 2013.  She has been in the dental field since 1999 and her experience is as a financial, treatment and insurance coordinator.  When she isn’t working she loves spending time with her family and friends.  She also loves to go country and western dancing, camping, fishing, hunting, boating, and has a love for pigs.  She resides in Corinth with her husband  Joe and their 3 daughters, Nichole, Kindle, and Mikaela as well as a grandson named Chase who was born in 2014.


                  Yvette Rodriquez

                  Treatment Coordinator

                  Yvette started with our practice in March of 2014. She started her career in dentistry in 2010 as a business office assistant and then as an office manager the last 2 years. She has four children who keep her very busy. She enjoys spending time with her family, traveling, and outdoor activities. Yvette and her family live in Denton.