[Problem] To provide a toothbrush, in which illumination of an interior of an oral cavity enables an assistant to grasp the state of the interior of an oral cavity of a person being assisted, and an uncomfortable strike against the interior of an oral cavity caused by a portion made of a hard material...http://www.google.fr/patents/US20050271997?utm_source=gb-gplus-shareBrevet US20050271997 - Toothbrush
