BriteSmile professional technology safely removes the staining and yellowing from your teeth, caps, veneers and composite fillings. The procedure takes one hour only. Dental professionals do it all for you in one visit, without any mess or hassle. Other "professional" procedures require several visits to the dentist and up to 4 weeks of at-home whitening with overnight bleaching trays. The whitening is guaranteed. Numerous clinical studies performed by BriteSmile and others show that whitening results confirm an average of 8 or more shades of improvement on the Vita-Pan shade guide and effective with lasting results. Independent safety studies, conducted by the University of Medicine and Dentistry of New Jersey and reviewed by senior researchers at NYU, prove that the BriteSmile professional teeth whitening treatment is safe. It is completely harmless to enamel, composites and all dental work. The patented BriteSmile whitening treatment consists of a lamp filtered to emit light in the blue-green region of the spectrum (approximately 400-500 nanometers) and a patented delivery device, which illuminates all smile teeth at once.