Dr. Matthew DiAndreth

diandrethA native of Perryopolis, Pennsylvania, Dr. Matthew DiAndreth attended Allegheny College in Meadville for three years, whereupon he received early acceptance into dental school at the University of Pittsburgh.  Receiving his Doctorate of Medical Dentistry in 1989, he attended the Endodontic Residency program at the University of Maryland in Baltimore.   He received his Endodontic certificate in 1995 and his Masters of Science in Oral Biology in 1996. Upon completion of dental school, Dr. DiAndreth accepted a commission of Lieutenant in the United States Navy.   He served as a dental officer at the Patuxent Naval Air Station, Maryland for two years.   During this time, he received a Meritorious Unit Commendation and the National Defense Service Medal.  He then served as the Dental Officer aboard the USS ASHLAND (LSD-48), where he was the commissioning officer responsible for establishing the dental clinic and protocols.   During this time, he received the Navy Achievement Medal. While in the United States Naval reserves, Dr. DiAndreth attained the rank of Lieutenant Commander in 1996. Dr. DiAndreth is a member of the American Dental Association, American Association of Endodontists, Pennsylvania Dental Association, North Hills Dental Study Club, and the Beaver Valley Dental Society.   He has served as the Vice President, President, and Director of the Beaver Valley Dental Society.  Currently, he serves on the board for the following organizations: HEARTH and the Botanical Gardens.

Dr. Albert Tomsic

AlbertTomsicDr. Albert Tomsic was born and raised just south of Pittsburgh in Canonsburg, Pennsylvania.  After graduating from Canon-McMillan High School in 1979, he attended West Virginia University, where he earned a Bachelors degree in chemistry.  He then attended dental school at the University of Pittsburgh and graduated with his Doctor of Dental Medicine degree in 1987. Dr. Tomsic then practiced general dentistry for the next 20 years, 17 were in his private practice in Canonsburg.  During that time, he attended numerous courses to better care for his patients, and from 1998 through 2003 he was a visiting faculty member at the L.D. Pankey Institute in Key Biscayne, FL. As Dr. Al journeyed through these educational experiences, he began to seriously entertain the idea of narrowing his focus to the area of endodontics and doing a two year residency.  So in 2007, he sold his practice and entered the Post-Graduate Endodontic Program at WVU.  In 2009, he earned both his specialty Certificate in Endodontics and his Masters of Science Degree in Endodontics. In his free time, Al enjoys cycling, tennis, karate, drawing and painting, and a bit of atrocious guitar playing.  He has been married for 18 years to Andrea, who obviously has a lot of patience.

Dr. Heidi Ray

Dr. Heidi Ray was born and raised in Western Pennsylvania. After attending Westminster College as a Chemistry major she received early acceptance into Temple University School of Dental Medicine. She received her BS in Chemistry with her Westminster graduating class of 1987. Dr. Ray received her D.M.D from Temple University in 1990 and her Certificate in Endodontics from Temple University in 1992. She attained Board Certification and became a Diplomate of the American Board of Endodontics in 2002. She maintained a practice with her brother Dr. Herbert Ray for almost twenty years before joining Precision Endodontics. Herb and Heidi have the honor of being the only brother sister team to be Board Certified. She is currently an Clinical Assistant Professor at The University of Pittsburgh School of Dental Medicine, and teaches the endodontic residents one day per week. Dr. Ray is currently a member of the American Dental Association, Pennsylvania Dental Association, Dental Society of Western Pennsylvania, American Association of Endodontists, American Board of Endontists and the College of Diplomates. She has served as Vice President and President of her local PDA district.

Dr. Christian Mangin

manginDr.  Christian Mangin received his dental degree from the University of Pittsburgh in 1998 and his Endodontic certification from Temple University in 2000. He also holds a Bachelor of Science degree from Brown University where he also played soccer. He is currently on faculty at the University of  Pittsburgh School of Dental Medicine. Dr. Mangin is a member of the American Dental Association, American Association of Endodontists, Pennsylvania Dental Association and served the Beaver Valley Dental Society as the former treasurer. Born and raised in Moon Township, Dr. Mangin graduated from Moon High School in 1990. He now resides in Moon Township with his wife Nicole and children Madison, Mia, Jack and A.J. He is an avid runner and loves to golf!

Dr. Mahshid Majlessi

Bio coming soon...


Dr. Ghattas Ayoub

dr-carolineDr. Caroline Ghattas Ayoub BDS, MSD, received her dental degree from Cairo, Egypt, after which she practiced general dentistry for 6 years. She then furthered her education, deciding to specialize in Endodontics, and received her MSD from Case Western Reserve University in 2015. Dr. Ghattas Ayoub recently completed her written board examination of the American Board of Endodontics and is determined to pursue her Board Certification in the near future. She volunteers once a week at Case Western Reserve University where she oversees the Endodontic residents in the clinic. Dr. Ghattas Ayoub is a member of the American Dental Association, American Association of Endodontists and the Ohio Association of Endodontists.

Dr. Fernando Ascencio

dr ascencioDr. Fernando Ascencio was born and raised in Guadalajara, Mexico.  After completing high school, he fulfilled his academic career at the University of Pittsburgh. At Pitt he completed a Bachelor of Science, a Doctorate in Dental Medicine, an Advanced Education in General Dentistry Residency, a Specialty Certificate in Endodontics, and a Masters Degree in Dental Science. .  Dr Ascencio continued to be involved in academics as a part-time faculty at the School of Dental Medicine upon graduating in 2002.  He has practiced endodontics for the last eight years in the South Hills of Pittsburgh. He is a member of the American Association of Endodontists,  the American Dental Association, the Pennsylvania Dental Association, and the Western Pennsylvania Dental Society. When not at the office, Dr Ascencio and his wife enjoy the busy life that comes along with raising four boys.  Sports and music play a big role in the Ascencio household.

Dr. Marissa Mikolich

marissaDr. Marissa Mikolich, received her DMD from the University of Pennsylvania and her MS degree from the Ohio State University, after which she practiced for 8 years at a private practice before joining Precision Orthodontics in Poland.  She specializes in orthodontic treatment of dental and skeletal malocclusions. Dr. Mikolich enjoys being able to provide patients with an esthetic smile and improving patient’s dental functions. She generally cares about each of her patients and considers them to be friends. On her free time, Dr. Marissa enjoys to bake, ski and spend time with her family watching Ohio State Football. Dr. Mikolich is committed to excellent care for our patients, making honesty and integrity her top priority. She strives to create a safe and friendly environment for all of her patients, striving for top-notch care which includes personal, individualized attention and high caliber orthodontic treatment.

Dr. Stephen Simpson

simpsonDr. Stephen Simpson is a Board-certified orthodontist with over 30 years of experience as a clinician, educator and leader in organized dentistry. He maintains a practice limited to orthodontics in Kent, Salem and Poland, Ohio, and previously served as a clinical instructor in the orthodontic department of Case Western Reserve University for 15 years. He is a former president of the Cleveland Dental Society, the Ohio Dental Association and the Ohio Association of Orthodontics and recently completed service as the Ohio chairman of the American College of Dentists. Dr. Simpson serves as an orthodontic consultant at the Craniofacial Center at Akron Children’s Hospital. He has conducted a presentation at the annual session of the American Dental Association on ethics, dispute resolution and clinical standards since 2006.

Dr. Wisam Sakr

Dr. Wisam SakrDr. Wisam Sakr graduated the Endodontic program from West Virginia University. He attended Herman Ostrow School of Dentistry at the University of Southern California receiving his D.D.S. Dr. Sakr also completed his General Dentistry Residency at the University of Pittsburgh in 2014. He is currently living in Poland, Ohio.

During his spare time, Dr. Sakr enjoys swimming, horseback riding, tennis, fencing and ice-skating. He is looking forward to serving our community and providing excellent care to our patients.


Dr. Nestor Foronda

forondaDr. Nestor Foronda was born on the island of Guam in the Pacific and raised in Los Angeles, California.  He attended the University of California, Los Angeles and attained a Bachelor of Science in Microbiology and Molecular Genetics.  After working for Children’s Hospital Los Angeles as a microbiology technician for four years, he ventured eastward to pursue dentistry at the University of Pittsburgh, where he met his wife Amber amongst his dental school classmates.  While studying at Pittsburgh, Dr. Foronda distinguished himself earning several scholarship awards, including the Dean’s Scholarship and the American Association of Endodontics Student Achievement Award.  He completed his DMD in 2004 and completed his postgraduate Endodontics certificate at the University of Pittsburgh in 2006 before joining the practice of Precision Endodontics. He is currently a member of the American Dental Association, Pennsylvania Dental Association, American Association of Endodontists and the Dental Society of Western Pennsylvania. Dr. Foronda resides in Hampton Township, and while not practicing, he enjoys spending time with his wife and raising his toddler son, Matteo while keeping up with Lily, the family dog.  He enjoys outdoor activities, such as road and mountain biking and taking scenic walks with his family.

Dr. Herberger

Dr. Herberger bestows Precision with 29 years of experience and integrity specializing in orthodontics, including palatal expansion. In addition to his compelling education of graduating from Ohio State Dental School DDS program, and from University of Pennsylvania’s Orthodontic program, he also associates his superb education from the knowledge he gained while working in private practices, as well as working with the Universities of Pennsylvania and Michigan, and educating in the orthodontic department at Case Western Reserve. Asking Dr. Herberger what he enjoys most from his career in dentistry, she’ll smile and say, “Helping people set that great smile.”


Dr. Tuyen T. Pham

tuyenphamDr. Tuyen T. Pham, DMD, MS graduated from the University of Pittsburgh School of Dentistry in 2006. She furthered her dental education at Jersey Shore University Medical Center’s general practice residency program. She then practiced general dentistry in the Pittsburgh area for two years before pursuing her two year master’s specialty program in Endodontics at West Virginia University Health Science Center. She is an active member of the American Association of Endodontists and the American Dental Association. Currently, Dr. Pham holds hospital privileges at Allegheny General Hospital and works part-time in the dental department providing patient care as well as teaching general practice dental residents Endodontic patient care. She also remains an active associate assistant professor at West Virginia Health Science Center, teaching dental students and endodontic residents. She also is an active advisory board member for the Silberg Dental Study Club. Dr. Pham lives in the South Hills of Pittsburgh. When she is not working, she enjoys staying active with her husband and children. Her other interests include hiking, playing tennis, and arts and crafts. Dr. Pham is committed to excellent care for your patients, making honesty and integrity her top priority. She strives to create a safe and friendly environment for all of her patients, striving for top-notch care which includes personal, individualized attention and high caliber endodontic treatment.

Dr. Ammar Al-Mahdi

Dr. Ammar Al-MahdiDr. Ammar Al-Mahdi bestows Precision Ortho Southmoor practice with his advanced education in General Dentistry. He received his BDS from Baghdad Dental School, and recently completed his 3-year Orthodontic Residency at OSU, as well as an internship in Orthodontics for one year. In addition to a compelling educational background, he also associates his superb education from the knowledge he gained while working as a General Practitioner in Iraq for 2 years. He has been recognized for the detailed finishing’s and the highest patient satisfaction among his peers. Ask Dr. Ammar Al-Mahdi what he enjoys most in his career of dentistry, he’ll smile and say, “There is nothing more joyful than having a patient laughing and jumping with whole-hearted appreciation for what has been delivered to their smile and life, that is why I’m an orthodontist and I am looking to do the very best for you