| Suffolk County | Nassau County | The Hamptons | 
| Hidden Smiles Orthodontix 136 Woodbury Rd Woodbury NY, 11797 (516) 367-4003 | Hill & Russo Endodontics - Edward N Russo DDS 6306 Jericho Tpke Commack NY, 11725 (631) 462-6888 | ||
| Hill & Russo Endodontics - Steven C Hill DDS 6306 Jericho Tpke Commack NY, 11725 (631) 462-6888 | Hill Steven C DMD 6306 Jericho Tpke Commack NY, 11725 (631) 462-6888 | ||
| Hills Donald DDS 136 Woodbury Rd Woodbury NY, 11797 (516) 367-9396 | Hills-Park Dental Arts - Euane J Newen DDS 2053 Deer Park Avenue Deer Park NY, 11729 (631) 254-6596 | ||
| Hills-Park Dental Arts - Lewis A Schneider DDS 2053 Deer Park Avenue Deer Park NY, 11729 (631) 254-6596 | Hirsch Ehrenman Khan PC - Glen Ehrenman DDS 959 Brush Hollow Rd Westbury NY, 11590 (516) 333-3033 | ||
| Hirsch Ehrenman Khan PC - Mahnaz Khan DDS 959 Brush Hollow Rd Westbury NY, 11590 (516) 333-3033 | Hirsch Ehrenman Khan PC - Norman Hirsch DDS 959 Brush Hollow Rd Westbury NY, 11590 (516) 333-3033 | ||
| Hirsch Kenneth DDS 2870 Hempstead Tpke Levittown NY, 11756 (516) 735-8723 | Hirsh Fred DR DMD 999 Central Ave Woodmere NY, 11598 (516) 569-0110 | ||
| Hoeglmeier Leonhard DDS 1 Winthrop Dr Huntington Station NY, 11746 (631) 421-1011 | Hoffer Harry DDS 222 E Main St Smithtown NY, 11787 (631) 979-7446 | ||
| Hoffman Craig A 761 Pulaski Rd Greenlawn NY, 11740 (631) 261-1555 | Horizon Orthodontics 1150 Portion Rd Farmingville NY, 11738 (631) 698-2424 | ||
| Howard Bruce E DDS OFC 267 E Main St Smithtown NY, 11787 (631) 724-0343 | Howard Burger PC - Howard Burger DDS 50 Route 111 Smithtown NY, 11787 (631) 499-4904 | ||
| Howard J Winter LLC - Howard J Winter DDS 29 Cedarhurst Avenue Cedarhurst NY, 11516 (516) 374-3140 | Howard J Winter PC 1999 Marcus Ave New Hyde Park NY, 11042 (516) 437-0249 | ||