Abstract: The present invention provides a device for tooth whitening which has a light source, at least one optical output a projection means for holding and positioning said optical output outside of a patient's mouth in a manner to so as to provide approximately simultaneous and uniform illumination of a patient's front teeth by said optical output; and a connection means for connecting said light source to said optical output. Also provided are methods of using the tooth whitening device with a tooth-whitening composition containing a transparent carrier compound and a transparent oxidizing compound which when in contact with the surface of a stained tooth and exposed to actinic light is activated to facilitate tooth whitening.