Jeff R. DeMercy, DDS

Dr. Jeff R. DeMercy received his bachelor’s degree in biology from Andrews University in southwest Michigan before continuing on to Loma Linda University for his dental education, where he graduated in 1985. He established his practice in Roswell in 1986, then in 2006 he was able to design and build our current location. Dr. DeMercy has received training in the relationship with dentistry and airway health. He works with several ENT’s in screening and creating intraoral devices for sleep apnea and has advanced training for Invisalign®. Education is a continual process with many study clubs and classes taken around the country to keep himself up to date on all the latest technology. Dr. DeMercy is a proud member of the American Dental Association and the Georgia Dental Association.

His goal has always been to provide quality dentistry so that patients are happy with the beautiful aesthetics of their smile. He loves having a career that he enjoys. Bringing his daughter, Amanda Kossick, into his practice as his partner was one of the best decisions he has made. As a team, they are able to consult and solve difficult dental issues.

In his free time, Dr. DeMercy enjoys water sports, snow skiing, photography, golf and traveling.

dr kossick

Amanda Kossick, DMD

Dr. Kossick received her undergraduate degree in Business at her father’s alma mater Andrews University before attending dental school at the Medical College of Georgia in Augusta, Georgia. She graduated and joined her father’s practice in 2013. She continues her education on a year-round basis through study clubs, courses, conventions, medical journals and online resources. She has specialty training in airway health, Invisalign® treatment and laser training for periodontal therapy. She has even received certifications for laser assisted periodontal surgery and airway screening. She is a member of the American Dental Association and the Georgia Dental Association.

Dr. Kossick strives to connect with her patients on a personal level and provide them with insight into their oral health through a systemic and holistic approach. She has loved growing up in this community and thoroughly enjoys seeing her patients. Family means so much to her and she is so grateful to not only care for families in Roswell but also work with her own. Roswell is an amazing place to work and live. She has loved watching our community grow and mature. It is a blessing to come to DeMercy Dental and provide care for Roswell.

When she is not working, Dr. Kossick loves personal fitness and health, traveling, reading, photography and spending time with her family.

Preetha M. Prasath, DMD

Dr. Preeth M. Prasath completed her Bachelor of Dental Surgery at Raja Muthiah Dental College at Annamalai University in Chidambaram, India. During her schooling, she was a Seminar House Officer in the Kilpauk Medical College Government at Royapettah Hospital in Chennai. She graduated in 2004 from Boston University, Goldman School of Dental Medicine, and continues her education every year. She has been practicing dentistry in Massachusetts and New Hampshire since 2004, and specifically in Georgia since 2021. She is also a staff dentist at Poisson Dental Facility at the Catholic Medical Center in Manchester, New Hampshire.

Dr. Prasath helps to provide gentle patient-centered care that improves their oral health and smiles. She appreciates the trust placed in her by each patient and strives to succeed in their expectations in treatment and results. It is fulfilling for her to help people develop their smiles and fill them with

Dr. Prasath’s husband is a business manager, her daughter is starting college, and her son is entering high school, both in the fall. Some of her hobbies include singing, crocheting and traveling with family and friends.

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