“We absolutely love it here! The dentists are all very professional, and do an excellent job. I have only positive things to say about this place, and all of the people who work here!”

- Nancy


Sean O'Brien, DMD

General Dentistry

Dr. O’Brien earned his B.S. degree in biological chemistry from Bates College in 2011, and completed his D.M.D. at the University of Connecticut School of Dental Medicine in 2015. While in dental school, Dr. O’Brien received several national awards in recognition of his research accomplishments in the Department of Reconstructive Sciences. Following graduation Dr. O’Brien completed a 12 month residency in the Advanced Education in General Dentistry program at the University of Connecticut. During his residency, Dr. O’Brien gained exposure to state of the art technologies and materials in restorative, implant, and cosmetic dentistry. He is a member of both the Massachusetts Dental Society, and the American Dental Association, and is committed to lifelong continuing education to stay current with the latest trends in the dental profession. Dr. O’Brien enjoys skiing, hiking, and spending time with family and friends.



“I’m fairly new to Wiemeyer’s Office and I’m currently being seen by Dr. O’Brien. I’m extremely happy I listened to a referral from a family member and started going to Wiemeyer. The office is very clean, modern, and the receptionist are extremely friendly. ”

— Justin

“As a mom of a 3 month old, my time is really limited. The gracious staff helped me find times that worked for my schedule, and even helped me when I had to feed my baby in the office! They always go above and beyond to take the time to get to know me and it is so appreciated. I recommend this dentist to all my friends. Lindsay and Dr. Sean deserve a special shout out for helping out this tired mom!”

— Wendy

“I was on a trip and fell and broke my front tooth. I thought I would have to get a crown on it. Instead, Dr. O’Brien saved the day and repaired it. It looks like new. So good that I forget that it was ever broken. What a hero! Thanks, Dr.!”

— Susan