Dentist & Team Bio

Our practice has a reputation for offering the most comprehensive dental care in a friendly, inviting, and professional environment. When you visit our practice, you’re not just another smile – you’re family!  See Dentist & Team Bio below.

  • Sandra Derringer, DMD, Owner

    I enjoy taking care of people, interacting with them and helping with their dental needs. I realize some people have concerns or fears of going to the dentist and I am respectful, compassionate, and even entertaining to help my patients have a pleasant dental experience. I treat all my patients as I would want to be treated or as I would treat my own daughters. I feel blessed to work with so many wonderful patients. We share our stories and lives with each other, celebrating fun events and creating meaningful relationships. I love educating them about the importance of maintaining their oral health or making improvements when necessary, and then celebrating when optimal health is achieved. I absolutely love practicing dentistry and have been working in a dental office since I was 15 years old! I was employed as a dental assistant, then attended Palm Beach Community College graduating in 1988 as a licensed dental hygienist. Gaining more and more respect for the profession and wanting to give more to my patients, I returned to school, Palm Beach Atlantic College, in 1990 to complete my prerequisites for dental school. I, then, continued my education at the University of Louisville School of Dentistry, graduating in 1997 with my Doctorate of Dental Medicine.

  • Olivia Faulkner Estes, DMD

    Dr. Olivia Faulkner Estes, a Cynthiana, KY native, completed her undergraduate education in Biology and Chemistry at Western Kentucky University and her Doctorate in Dentistry at the University of Kentucky College of Dentistry. Dr. Estes’ caring nature has allowed her to establish great relationships with her patients. She believes in furthering and expanding knowledge within the dental field. She is an active member of the American Dental Association and Kentucky Dental Association, where she serves as the New Dentist co-chair. Dentistry runs in Dr. Estes’ family! Her dad and younger sister are both general dentists. Her husband, Dr. Ryan Estes, is a periodontist and owner of Perio-Implant Care in Florence. Outside of the office, Dr. Olivia enjoys reading, traveling, spending time with friends and family, especially her two chocolate labs, Malley and Titan.

  • Debbie Gabbard, AADOM, Office Manager

    New member of our team! Bio to be provided soon!

  • Brooke Harris, Scheduling Coordinator

    Brooke joined our team in 2015. She has been a part of the dental field for 4 years. She love’s working with patients and helping them out with their needs. You will always find Brooke at the front desk with a friendly greeting, and a smile on her face! Brooke attended the Institute of Dental Technology where she became a certified EDDA dental assistant in 2012. In her spare time she enjoys photography and taking creative photos of friends and family, and the occasional wedding. She also enjoys crafting, and searching for antiques on weekends. Being a part of our dental team is a blessing. I truly love seeing the smile of patients faces each day!

  • Manda Fife, Expanded Functions Dental Assistant (EFDA)

    Manda works alongside Dr. Derringer assisting our patients when they come into our office for treatment, and you will normally find her placing fillings, designing crowns, working with our invisalign patients and assisting Dr. Derringer with Botox treatments. Manda has been in the dental industry for 9 years and returned to school to obtain her EFDA qualification, graduating from Indiana University in 2010. Manda has been a part of our Dental Family since 2011, and takes great pride in building relationships with our patients and getting to know them and their families. Manda lives on her Farm in Hillsboro OH, with her husband Jesse and her gorgeous baby Harper.

  • Danielle Miller, Registered Dental Hygienist (RDH)

    Danielle began her career as a Dental assistant in 2006 while she attended Colerain High School. Upon graduation she realized that she wanted to be more involved in patient education and care, and graduated from UC Blue Ash (Raymond Walters College) in 2012 with her AAS in Dental Hygiene. Danielle joined our team in 2014, and our patients describe her as sweet and friendly, and gentle yet thorough. Danielle spends time with her patients getting to know them and their families and connecting with them on a personal level. Danielle is a member of the American Dental Hygienists Association and is consistently taking classes to keep up to date with the latest methods and techniques. In her free time, Danielle enjoys boating, and being active with her husband Mike, and her friends and family.

  • Theresa Evans, Expanded Duty Dental Assistant (EDDA)

    Theresa joined our team in 2000 and has worked in the dental industry for over 20 years. She works with both of our doctors assisting them with dental treatment on our patients including fillings, extractions, crowns, implants, and dentures. Theresa grew up in Union and is a familiar face to all of our patients, and considers many of them to personal friends! Theresa attended NKHOC for Dental assisting to become a Certified Dental Assistant through the Dental Assisting National Board (DANB), and then furthered her education through the University of Louisville to become an Expanded Duties Dental Assistant (EDDA). Theresa is a proud mom of two daughters, Jennifer and Jessica, who are students at UK and NKU and enjoys spending her free time riding horses, hiking, and spending lots of time outdoors!

  • Kristen Weddle, Registered Dental Hygienist (RDH)

    New member of our team! Bio to be provided soon!

Get in Touch

Derringer Dental Care & Rejuvenation is committed to building a long lasting relationship with you, your family, and the rest of our community.  We are conveniently located on Hwy 42 on the border of Union & Florence, KY near the Union Kroger and right next to Skyline Chili.


Mon, Wed, Thur 8am – 5pm

Tues 8am – 7pm

Fri 7am – 2pm


Address 8667 US Hwy 42 STE 100

Union, KY 41091 

Phone 859-384-0393


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