Abstract: A teeth whitening system includes a heating module, a mouthpiece thermally connected to the heating module such that heat can be transferred to the mouthpiece, and a thermocatalytically activated whitening gel positioned in the mouthpiece such that the gel contacts a user's teeth, whereby when heat is transferred from the heating module to the mouthpiece, the gel is activated by heat, metal surface catalysis, and water or saliva to whiten the user's teeth.