HomeDr. O'Brien

Your Longmont Dentist

Dr. Robert O'Brien


Dr. O'Brien is a family dentist with more than 20 years of experience. He is well regarded for his compassionate and conservative approach to dentistry. Becoming a dentist appealed to Dr. O’Brien because it was a profession that enabled him to engage in two of his passions – working with his hands and working with people. Dr. O'Brien won’t try change his patients' smiles – he focuses on making their current smiles the best they can be.

He graduated from the New York University College of Dentistry in 1992, and worked as an Associate Dentist in several practices in New York and Colorado before establishing his own practice in Longmont, CO in 1999. He has received recognition from both United Concordia and Delta Dental insurance companies for providing excellent preventative care and outstanding service to his patients.

If you're looking for a long-term partner who can help your family maintain and improve its dental health, schedule an appointment with Dr. O'Brien today. His office is located in Longmont, Colorado, in the heart of Boulder County.  He serves patients in the surrounding cities of Boulder, Brighton, Broomfield, Denver, Erie, Estes Park, Lafayette, and Louisville.



Office Hours

Monday 8 am – 5 pm
Tuesday 8 am – 5 pm
Wednesday 8 am - 5 pm
Thursday 8 am – 5 pm
Friday By appointment
Saturday Closed
Sunday Closed


1446 Hover Street, Suite 100
Longmont, Colorado 80501
(15th & Hover)

Click here for a Map

Contact Us

Phone: (303) 684-9700
Fax: (303) 648-6088
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Schedule An Appointment

Same day appointments available.

Request an appointment online.

New patients welcome.

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