If you’re a greenie who likes white teeth there is a growing resource of eco-friendly dentists to choose from. Dentists with environmentally friendly practices make an effort to reduce waste and pollution, save energy and water and using high-tech and green solutions such as digital x-rays. GreenBiz.com reports there is now a certification offered for dentists who operate eco-friendly offices. The Eco Dentistry Association offers a GreenDOC dental certification for practices with green dental procedures, office designs and office administration. Some of the changes encouraged by the association include installing energy efficient lighting and converting to digital x-rays which can prevent the disposal of at least 200 liters of toxic x-ray fixer and more than 17,000 lead foils in five years. The Eco Dentistry Association also promotes a mercury waste amalgam separator to divert nearly 4 tons of  dangerous mercury waste every year. The Environmental Protection Agency says about 50 percent of the mercury entering local waste treatment plants come from old fillings that contain mercury. Dentists are also encouraged to instruct their patients to turn off the tap water while brushing their teeth to help reduce water consumption. Patients looking for an eco-friendly dentist can check this registry for a list of Eco Dentistry Association members.