Our Dentists

Dr. Michael Sargent, DDS


1983 Georgetown University, Omicron Kappa Upsilon (OKU)
1979 St. Anselm College - BA, Summa Cum Laude
1975 Chelmsford High School
Mass Dental Society *American Dental Association *Greater Lowell Dental Society *American Association of Cosmetic Dentistry (AACD)
Work & Volunteer Experience:
Dr. Michael Sargent has a private family practice in Chelmsford, MA that he started in 1983. He specializes in family and cosmetic dentistry and is licensed to practice dentistry in Massachusetts.Dr. Michael Sargent has served as Chelmsford's Santa Claus for 25 years at the tree lighting ceremony! He also works on the Town of Chelmsford scholarships. In the summer of 1982, Dr. Sargent volunteered to spend the summer in the Dominican Republic on the Haitian border providing dental care to those living in the mountain villages. This was a part of the Georgetown organization for Latin American countries (GOLAC) and it was extremely fulfilling.

Dr. David Markham, DMD


1995-96 General Practice Residency, VA Hospital, Manchester, NH
1995 Tufts University School of Dental Medicine, Magna Cum Laude
1990 College of the Holy Cross - Bachelor of Arts
1986 Chelmsford High School

Omicron Kappa Upsilon (OKU) National Dental Honor Society *American Dental Association *Massachusetts Dental Society *Merrimack Valley District Dental Society * Greater Lowell Dental Society
Work & Volunteer Experience:
Dr. Markham attended dental school at Tufts University School of Dental Medicine, earning the credentials DMD degree and is licensed to practice dentistry in Massachusetts.Dr. Markham visits Chelmsford elementary schools each February to teach first grade students about proper dental health and oral hygiene. He also volunteers his time by helping coach freshman football at Chelmsford High School and as a coach for Chelmsford Youth baseball.

Dr. Franklyn Liberatore, DMD


1994 Tufts University School of Dental Medicine
Residency - SUNY Stony Brook Long Island
St Johns University, Biology
Work & Volunteer Experience: In his quest to provide the best possible care to his patients, Dr. Liberatore has taken extensive continuation education courses over his career. He has attended The Dawson Academy for Advanced Dental Studies and the Pankey Institute, two internationally renowned institutions for advanced studies in dental education. He began practicing in New York in 1995. In 2002, he decided to move to Italy where he practiced until the spring of 2010. After a wonderful eight year experience in Italy, Dr. Liberatore returned to the United States and chose to settle in Nashua, New Hampshire. He focuses his quest on the repair of the worn dentition, esthetic dentistry, and TMD, although he enjoys all aspects of general dentistry and believes that prevention of disease is the best service that he could ever provide to patients.

Our Dental Hygienists

  • Sandra Ayer, R.D.H
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    1979 Forsyth School for Dental Hygiene
    Associates Degree in Dental Science
    Northeastern University
    Associates Degree in Pharmacy
    Work Experience:
    Sandra has been working at Dr. Sargent's office since 1983. She has been a valuable addition to our office from day one, and enjoys telling patients that she has been friends and co-workers with Dr. Sargent for 32 years!

  • Elizabeth Bettencourt, R.D.H.

    1999 Middlesex Community College
    Work & Volunteer Experience:
    Elizabeth Bettencourt has worked with Dr. Sargent since the Fall of 1996, when she started working at the front desk. In 1999, Elizabeth became a Registered Dental Hygienist and has been a valuable part of our team ever since.Elizabeth enjoys educating school children about oral health in a classroom setting.

  • Kathy Vowels, R.D.H.

    1985 Middlesex Community College
    Work Experience:
    Kathy has been working at Michael Sargent's office since 1985. She has been with our team for 31 years!

  • Lisa Brucato, R.D.H

    Middlesex Community College, Associate in Science
    1988-1990 Dental Lab Technology, Associate in Science
    1990-1992 Dental Hygiene
    Work Experience:
    Lisa has been working with Dr. Sargent since 1992. She has been a valuable part of our team for the past 24 years.

  • Colleen A. Dempsey, R.D.H.

    1994 Middlesex Community College
    1994 Associate in Science, Dental Assisting
    2002 Associate in Science, Dental Hygiene
    Work & Volunteer Experience:
    Colleen worked as a Dental Assistant for 6 years before starting Dental Hygiene school in 2000. After graduating Hygiene school at Middlesex Community College in 2002, she began working for Dr. Michael Sargent. Colleen has been a part of our team for the past 13 years. Colleen has participated in the team seal program at Middlesex Community College. This program provides sealant for school age children in Lowell, MA.

Patients Say

"Dear Michael Sargent, After switching dentists I have realized that you are the best and I miss your office very much! The dentist office that I go to now is awful...I would like to thank you for being a great dentist all these years! Every time I went to your dentist office I always had a nice visit and your employees were gentle and kind. I'll never forget the time you let me choose a stuffed animal for being a good patient. That made my day.....I miss your fish in the waiting room...and you of course."


"Dear Dr. Markham, Your gentle, caring ways added with lots of patience makes a fearful person very comfortable and lightens the fear of the dentist chair. A difficult and grateful patient thanks you."


"Dear Dr. Markham, Thank you very much for the excellent dental work you did on my teeth, especially the lower bridge. You were very patient."


"Dr. Mike, Thank you for helping T and making her laugh yesterday. She was more herself after leaving your office. You are a great dentist, but more important you are a good guy! Again, thank you. God Bless."


"Dear Dr. Sargent, A current television commercial tells me I should love my dentist and whenever I see it, I confirm aloud "I DO! I DO!". Thank you very much."


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