Sheehan Orthodontics: Bridging Generations of Smiles. Offices conveniently located in Duxbury, Plymouth and Sandwich.  We are an Orthodontic Specialty practice that treats children, adolescents and adults with traditional braces and aligners (Invisalign, Ormco Spark and 3M Aligners). Sheehan Orthodontics is an orthodontic practice dedicated to creating beautiful, healthy smiles since 1995. Our commitment extends beyond just orthodontic treatment; we prioritize providing an exceptional experience in a warm, friendly, caring and professional environment. Complimentary consultations, convenient locations, exceptional results!