The present invention is directed to a method of making a teeth treatment device, the method including the steps of passing a substrate through a container having melted wax therein to form a wax saturated substrate; applying a quantity of bleaching solution to one side of the wax saturated substrate;...http://www.google.es/patents/US7849661?utm_source=gb-gplus-sharePatente US7849661 - Teeth treatment device
