Cos Cob Dentist

Voted Top Dentist in Greenwich by Peer Review

Our Staff

Dentist in Cos Cob

Our entire team is dedicated to providing you with the personalized, gentle care that you deserve.
From left to right: [back row] Kristen Lopez; Yvonne Mastej; Dr. Masis Yeterian;
[front row] Niva Gov-Ari; Nelly Monick; Ellie Guiffra; Izabella Ozarowsk.

Ellie Guiffra

Cosmetic Dentist in Cos Cob Ellie Guiffra graduated from Greenwich High School and went on to complete a secretarial and business course of studies at the Norwalk State Technical College, currently known as Norwalk Community College. Before joining the practice, she was the Executive Assistant to the General Sales Manager and five sales reps from the Paper Sales Southern Division of The Great Northern Nekoosa Corporation. She currently resides in Riverside, CT with her husband.


Niva Gov-Ari

Dentist near GreenwichNiva Gov-Ari graduated from the Hebrew University Hadassah School of Dental Medicine in Jerusalem, Israel in 1991 with a degree in Dental Hygiene. In 2001, she came to the U.S. with her family, and after completing the requirements for U.S. licensing, she earned her degree and graduated from The Fones School of Dental Hygiene at Bridgeport University. In 2003, Niva was hired as a part-time hygienist and remained so, until in 2007, under the employment of Dr. Yeterian, she took the position as full-time hygienist.

Marcela Barreto


Marcela was born and raised in Brazil. She got her bachelor's degree in Biology from the University of Taubate, Sao Paulo, Brazil and came to the U.S. to study English as a cultural exchange student. She then decided to pursue a career in dental hygiene acquiring a second degree from the Fones School of Dental Hygiene. Marcela takes patient care very seriously, providing quality treatment, patient education and a gentle experience. She enjoys the opportunity to positively impact each and every patient of the day with a healthy and beautiful smile. Marcela is a passionate mother of two young children. She loves to spend time with her family and travel the world.

Yvonne Mastej

Cosmetic Dentist near GreenwichYvonne Mastej got her degree as a Certified Dental Assistant from the Dental Careers Institute, Orange, CT, in 1998. She joined Dr. Yeterian in 2010 as a part-time chairside assistant.

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Office Location
Mill Pond Village
211 East Putnam Avenue
Suites 2-6
Cos Cob, CT 06807
Phone: (203) 869-2884
New Patients: (203) 529-4217

Office Hours

Monday: 8:00am - 5:00pm
Tuesday: 8:00am - 5:00pm
Wednesday: 8:00am - 5:00pm
Thursday: 8:00am - 5:00pm
Friday: 8:00am - 12:00pm
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