Franklin Square Dentist. Dr. Jeffrey P. Giller, DDS provides Periodontist, Dental Implants, Gum Disease, Gum Surgery, Oral Hygiene to the following locations: Nassau County, Garden City, Malverne, New Hyde Park, Long Island. Nassau County Dentist providing excellent dentistry including Periodontist, Dental Implants, Gum Disease, Gum Surgery, Oral Hygiene in Franklin Square, Nassau County, Garden City, Malverne, New Hyde Park, Long Island, New York.