Meet Our Doctors
Dentist Reston, VA
Quyen Dang, D.D.S.
Dr. Quyen Dang earned his Doctorate of Dental Surgery from Howard University. With more than 15 years in dentistry, Dr. Dang has maintained an ongoing commitment to education. This has led him to train and earn certifications in a variety of dental treatments, including:
- Invisalign® Premier Preferred Provider
- Six Month Smiles® short term orthodontics
- Lumineers® dental veneers
- Implants dentistry
- Cosmetic full-mouth makeover
Dr. Dang has designed Optimal Dental Center as a state-of-the-art facility where beautiful, healthy smiles are created. Over his years in dentistry, Dr. Dang has been recognized as a top dentist in Virginia by Virginia Living magazine each year beginning in 2010. The Consumer Research Council of America named him one of the nation’s top dentists in 2007, and every year from 2011 – 2015. Washingtonian listed Dr. Dang as a top dentist in 2015, as well.
Dr. Dang maintains professional memberships in the following organizations:
- International Congress of Oral Implantologists (ICOI)
- American Dental Association (ADA)
- Virginia Dental Association (VDA)
- Academy of General Dentistry (AGD)
- Dental Organization for Conscious Sedation (DOCS)
- American Academy of Cosmetic Dentistry (AACD)
- American Academy of Facial Esthetics (AAFE)
Assal Assadi-Moghadam, D.M.D.
Born and raised in the Washington, D.C. greater metropolitan area, Dr. Assadi graduated from Hollins University with a B.A. in Studio Art and French. Shortly afterward, she graduated from Virginia Commonwealth University with a B.S. in Biology and Chemistry. Dr. Assadi earned her Doctor of Dental Medicine degree with honors from Tufts University in Boston, Massachusetts.
Dr. Assadi continues to study dentistry through numerous continuing education programs, including the world renowned Spear Education curriculum in Scottsdale, Arizona. She is a member of the Spear Study Club in northern Virginia as well. Dr. Assadi is currently working on her Fellowship in advanced studies from the Academy of General Dentistry and is affiliated with the following Associations to provide the highest level of dental care to her patients:
- Academy of General Dentistry
- American Academy of Facial Esthetics
- American Academy of Implant Dentistry
- Spear Study Club (Spear Faculty Club 2017)
- American Academy of Cosmetic Dentistry
- American Dental Association
- Northern Virginia Dental Society
- Virginia Dental Association
- The American Academy for Oral Systemic Health
- American Academy of Craniofacial Pain
Dr. Assadi offers comprehensive, personalized dental care to all of her patients. She strives to deliver the best dental care for all her patients by incorporating the philosophy of complete dentistry into practice, helping patients achieve lasting, comfortable smiles by addressing underlying dental problems. Dr. Assadi is a certified Invisalign® provider in clear aligner tray therapy, and is certified by the American Academy of Facial Esthetics in Botox® therapeutics for TMJ and Facial Pain therapy.
Dr. Assadi spends her free time traveling around the world exploring other cultures, cooking, yoga and enjoys all Art forms.
Dr. Hieu Nguyen earned her Bachelor of Science with honors from George Mason University. She then went on to graduate with honors as one of the top 10 in the class of 2009 from Howard University College of Dentistry. Along with her Doctorate of Dental Surgery, Dr. Nguyen gained membership in the Pi Pi Kappa National Dental Honor Society.
Dr. Nguyen has continued her pursuit of excellence beyond the classroom. She was selected an American Top Dentist in 2010 by American Top Dentist Journal. Dr. Nguyen has been honored by The Leading Physicians of the World magazine, and was selected as Top Dentist of 2015 by the International Association of Dentists. She maintains memberships in the American Dental Association (ADA), the Virginia Dental Association (VDA), and the International Association of Dentists (IAD).
Outside the office, Dr. Nguyen has a passion for service and continuing education. She believes strongly in community and regularly provides free dental services to low income Fairfax and Loudon county families through NOVA Dental Clinic. Dr. Nguyen is actively involved in Operation Smile and Hope for Tomorrow, which support fund raising to provide free dental services for unfortunate children in third world countries, such as Vietnam.
Dr. Nguyen is a member of Columbia Baptist Church, where she teaches Youth Sunday School and acts as assistant treasurer for the Vietnamese congregation.