Welcome to Merit Dental
Manchester, PA!
It is our pleasure to partner with you in your dental care. Whether you are a new patient or already part of our family, Merit Dental Manchester offers a wide range of general dental services, cosmetic dentistry and restorative dentistry for adults and children.
We accept most insurance and offer new patient specials. If you have any questions, please give us a call.
Dental Services
We are trained in the latest advances in dental treatment and are empowered to focus on the best care for you and your family. Our services include:
Accepted Insurance
Merit Dental accepts a wide range of dental insurance plans*, including plans from:
- Aetna
- Ameritas
- Assurant
- Blue Cross Blue Shield
- Cigna
- Delta Premier
- Dental Health Alliance (DHA)
- Guardian
- Humana
- MetLife
- Principal
- Sun Life
- Tricare – ADDP
- United Concordia
- UnitedHealthcare
*This is not a comprehensive list, and is subject to change. Please contact your insurance provider to verify coverage and acceptance.
New Patient Offers
Please print out one of the offers below and bring it with you on your first visit to redeem.
Print Offers$99
New Adult Patient
exam, cleaning & x-rays
Regularly $238 - $407
$59
New Child Patient
exam, cleaning & x-rays
Regularly $170 - $258
New patients only. Cannot be used with insurance, state or federal programs, or combined with other offers. If gum disease is present, offer limited to exam and x-ray. Child patient offer for ages 12 and under. PPE and infection control fee included in promotional price. Limited time only.

FREE
Oral-B Power Toothbrush
Following exam & x-rays

New patients who make an appointment at Midwest Dental will get a free Oral-B toothbrush at their first visit following exam & x-rays. Cannot be used with federal or state programs or combined with other offers. Limit one offer per person. Product value up to $20. While supplies last.
Print OffersAbout Our Dentists

Dr. Tassia Masgalas
- Area of Practice: General Dentistry
- Education: Albright College, BS Biology
Georgetown University School of Dentistry, DDS
- Interests: She enjoys playing tennis, biking, and hiking. She also likes to cook ethnic foods and do Argentine tango dancing.
- Personal Statement: "I believe in helping patients to make informed decisions and providing the best care. I strive to always provide gentle care to help them be comfortable at all their visits. "

Dr. Sarah K. O'Sullivan
- Area of Practice: General Dentistry
- Education: Lebanon Valley College - B.S. in Chemistry
Temple University School of Dentistry - D.M.D. - Advanced Training: Soft tissue laser surgery, restoration of dental implants for single- and multi-tooth replacement
- Memberships: Academy of Laser Dentistry
- Interests: Enjoys quilting, hiking, yoga, and choral singing
- Personal Statement: "Optimal dental health is part of living life to the fullest. I believe that earning a relationship of trust between patients and the dental team is the foundation of good dentistry. My mission is to provide high quality dental care in an educational, compassionate atmosphere that respects each patient's individual needs."

About
Our Dentist
Dr. Tassia Masgalas
Dr. Tassia Masgalas
- Area of Practice: General Dentistry
- Education: Albright College, BS Biology
Georgetown University School of Dentistry, DDS
- Interests: She enjoys playing tennis, biking, and hiking. She also likes to cook ethnic foods and do Argentine tango dancing.
- Personal Statement: "I believe in helping patients to make informed decisions and providing the best care. I strive to always provide gentle care to help them be comfortable at all their visits. "

About
Our Dentist
Dr. Sarah K. O'Sullivan
Dr. Sarah K. O'Sullivan
- Area of Practice: General Dentistry
- Education: Lebanon Valley College - B.S. in Chemistry
Temple University School of Dentistry - D.M.D. - Advanced Training: Soft tissue laser surgery, restoration of dental implants for single- and multi-tooth replacement
- Memberships: Academy of Laser Dentistry
- Interests: Enjoys quilting, hiking, yoga, and choral singing
- Personal Statement: "Optimal dental health is part of living life to the fullest. I believe that earning a relationship of trust between patients and the dental team is the foundation of good dentistry. My mission is to provide high quality dental care in an educational, compassionate atmosphere that respects each patient's individual needs."