General dentists, pediatric dentists, endodontists, and prosthodontists are required to install an amalgam separator in their offices and certify with the Massachusetts Department of Environmental Protection (MassDEP) that the office is in compliance with this regulation. Oral surgeons, periodontists, and orthodontists do not need to install a separator at this time. After initial certifications are filed with the MassDEP, renewal certifications are required every two years (by March 31 of every even-numbered year, which coincides with dental licensure).