Composition for whitening human teeth, the composition comprising peroxide and optionally further comprising photosensitizing agents, gelling agents, humectants, pH-adjusting agents, stabilizing agents, desensitizing agents, and accelerating agents or bleach activators, wherein the whitening process comprises applying the whitening composition to at least the anterior surfaces of at least six mandibular or maxillary anterior teeth and maintaining the whitening composition on the at least six teeth for a first time period; providing at least a first array of inner light sources comprising a plurality of inner LEDs , wherein the plurality of inner light LEDs includes from four to six LEDs disposed in a first plane and forming a first inner arc and a first outer arc comprising a plurality of outer LEDs , wherein the plurality of outer light LEDs includes from two to four LEDs disposed in a first plane , wherein each LED has an axis of primary focus , defined as the axis along which the LED-emitted light has the highest intensity and wherein the axes of primary focus of all LEDs of the respective arc intersect at the focal point of that arc, wherein the first inner arc has a first inner focal point and the first outer arc has a first outer focal point different from the first inner focal point ; after the first time period, directing a light radiation comprising blue visible light with a peak intensity of 450-470nm of at least a threshold intensity from the least first array of light sources for a second time period to the anterior surfaces of the at least six teeth, the first time period having a duration greater than 50% of a total duration of the first time period and the second time period; and removing the whitening composition from the at least six teeth. applying the whitening composition to at least the anterior surfaces of at least six mandibular or maxillary anterior teeth and maintaining the whitening composition on the at least six teeth for a first time period; providing at least a first array of inner light sources comprising a plurality of inner LEDs , wherein the plurality of inner light LEDs includes from four to six LEDs disposed in a first plane and forming a first inner arc and a first outer arc comprising a plurality of outer LEDs , wherein the plurality of outer light LEDs includes from two to four LEDs disposed in a first plane , wherein each LED has an axis of primary focus , defined as the axis along which the LED-emitted light has the highest intensity and wherein the axes of primary focus of all LEDs of the respective arc intersect at the focal point of that arc, wherein the first inner arc has a first inner focal point and the first outer arc has a first outer focal point different from the first inner focal point ; after the first time period, directing a light radiation comprising blue visible light with a peak intensity of 450-470nm of at least a threshold intensity from the least first array of light sources for a second time period to the anterior surfaces of the at least six teeth, the first time period having a duration greater than 50% of a total duration of the first time period and the second time period; and removing the whitening composition from the at least six teeth. <EOS>