A device and a method for delivering UVA light to the mouth in which a photocatalytic agent is distributed in the mouth and a UVA light source is located contiguously to the head of the device so that the photocatalytic agent distributed in the mouth is efficiently activated by UVA light produced by...http://www.google.ca/patents/US20040019990?utm_source=gb-gplus-sharePatent US20040019990 - Enhanced dental hygiene system with direct UVA photoexcitation
