An arrangement, for use in whitening a patient's teeth includes an arched surface and an array of light-generating devices, for example, light emitting diodes positioned on the arched surface. The light-generating devices are arranged to form a relatively uniform field of light in a particular range...http://www.google.es/patents/US7572124?utm_source=gb-gplus-sharePatente US7572124 - Apparatus for simultaneous illumination of teeth
