Call Us

(301) 441-8686

Opening Hours

Tues-Fri: 8:00 A.M - 4:30 PM Sat-Mon: Closed

Request an Appointment

Request your appointment with us today!

Call Us

(301) 441-8686

Opening Hours

Tues-Fri: 8:00 A.M - 4:30 PM Sat-Mon: Closed

Request an Appointment

Request your appointment with us today!

Our Staff

Dr. John Powers
Dentist

Dr. Powers has been practicing dentistry for more than 30 years. After graduating from the University of Massachusetts at Amherst, he attended the University Of Pennsylvania School Of Dental Medicine, receiving his dental degree in 1980. After a general practice dental residency, Dr. Powers began practicing in Greenbelt, Maryland in 1981.

Patients love Dr. Powers' empathetic and compassionate dental care. In addition, they appreciate his desire to expand and advance his dental expertise. He frequently attends courses on Oral-Systemic Health, Laser Dentistry, Smile Design, Invisalign, Ultimate Occlusion, Sedation Dentistry Oral Cancer detection and prevention. Thus, he's able to empower his patients with an array of treatment options.

Dr. Mary Alexander
Periodontist

Dr. Mary Alexander, periodontist, obtained a Bachelor of Science degree in Biology from the University of South Carolina and continued her education in dentistry at the University of Maryland School of Dental Surgery where she received her DDS degree. Prior to and during her dental studies, Dr. Alexander received funding and support from the National Institutes of Dental Research for her involvement in the periodontal research.

After obtaining her DDS degree Dr. Alexander spent one year at the Veteran's Administration Hospital, in general practice residency focusing her training in the area of anxiety patient management. She then attended Harvard University and earned her clinical specialty in periodontics and a doctorate in medical science. Her doctoral research was focused in the study of bone function and metabolic disease of the bone.

Dr. Alexander received extensive training in dental implantology, periodontal plastic surgery, bone regenerative procedures and sedation dentistry. All aspects of Dr. Alexander's training are incorporated in her periodontal practice assuring patient's thorough and comprehensive periodontal treatment.

Terrie Deters
Office Administrator

Terrie is our business office administrator. Her dental experience spans four decades as a certified dental assistant, consultant and business office manager. She enjoys working with patients to help them achieve their dental journey and continuing her education keeping dentistry her career passion.

Outside of the dental office, Terrie enjoys gardening, pool time, a sunny beach and sleepovers with her grandchildren. She has been married to her best friend, Dan for 40+ years. Together they have enjoyed the blessings of their two grown children and their spouses, five grandchildren and the continued fun times with their elderly parents. Terrie also enjoys her large Italian-German family and can always be found preparing for a family event. Quiet time seldom exists for this happy grandmother as her grandchildren light up her world.

Sonai (Sunny) Roy
Office Administrator

Sonai is the newest addition to our practice with over 17 years of experience in customer service and 2+ years in the dental health care field. As the scheduling coordinator/ social media administrator in our practice, she takes great pride and joy in getting to know our patients. The care and well being of our patients is her highest priority.  She is extremely happy to take part in giving them a great dental experience.

Sonai is the youngest of 6 siblings! Coming from a military family she has no problems making friends wherever she goes. Sonai currently resides in DC. In her spare time, she’s enjoying being a PAL Hawk football mom to her son. She loves to play “tourist” in DC and find events to do with her family. She prides herself on finding great deals and being thrifty. She is a lover of life! Her alias “Sunny “ completely embodies her bright personality.

Barbara Sherry
Registered Dental Hygenist

Barbara has been a practicing dental hygienist for over 30 years. She first entered the field of dentistry as a certified dental assistant in 1978. After working for a few years and with a desire to further her education, she headed to Allegany Community College in Cumberland, Maryland, where she earned her dental hygiene degree in 1982.

Barbara and Dr. Powers met 30  years ago and worked together for several years before Dr. Powers opened his own practice. In 1992, Barbara reestablished her working relationship with Dr. Powers and joined him in his Greenbelt office. Currently, Barbara works days when needed to provide support for others in the practice.

Barbara has been married to her husband for 28 years. They have three wonderful children.

Janet Freitag
Registered Dental Hygenist

Janet blesses our dental team with her vast clinical experience of 25 years and her wide palette of talents. She serves our patients primarily as a dental hygienist. Amazingly she clones herself as a dental assistant and business administrator. Her dental knowledge and wisdom come from her late father, a retired dentist, her dental hygiene education at Allegany College, and working previously with other top dentists featured in magazines and on television. Janet thrives at the forefront of dentistry by attending elite dental courses at the Hornbrook Group and Las Vegas Institute (LVI), just to name a few.

Janet keeps her fingers limber as an award-winning quilter and master gardener, receiving numerous awards and accolades. Her passion for life impacts her community, not only as a Girl Scout troop leader, but also being recognized as a Berwyn Heights Citizen of the Year. Janet enjoys the outdoors with her husband and daughter.

Angelie Arroyave
Registered Dental Hygenist

Angelie is our newest dental hygienist. She brings 9 years of experience in the dental field and one of her teachers in hygiene school at Fortis College was her predecessor, Sandra, so we know she's well trained! She brings the latest techniques to her patients and really enjoys what she does to help them become as healthy as possible.

Angelie grew up in Virginia and is the youngest of four sisters.  She enjoys quality time with her Columbian husband and her family.

Debbie Swingle
Registered Dental Assistant

Debbie, a registered dental assistant, has been working with Dr. Powers for 13 years of her 23-year dental career. She has a great wealth of dental information to draw on. Debbie is a true caregiver, in every sense of the word. Being very patient-oriented, she ensures that all of our patients are comfortable and given the best care available. She takes great pride in what she does.

Debbie is a native Marylander. She is married with four grown children. Debbie enjoys camping, gardening, riding motorcycles and caring for others. Above all, she loves her eight grandchildren, including a set of twins.