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Dr. Polgrean became a board-certified Diplomate of the American Board of Orthodontists in 2005. Our office is located in Londonderry, NH and provides orthodontic treatment for children, teens, and adults in many surrounding communities including Derry, Windham, East Derry, Hampstead, Sandown, Chester, Auburn, Manchester, Raymond, Atkinson, Salem, Pelham, Litchfield, Merrimack, Hudson, Nashua, Bedford, Goffstown, Hooksett, and Candia.