Quick Answer Six facts about teeth whitening: it works only on natural teeth, DIY hacks can damage enamel, results last 1 to 3 years, sensitivity afterwards is temporary, smoking and tea/coffee shorten the result, and whitening differs from cleaning. Professional whitening done correctly is safe. Medically reviewed by Dr. Saurabh Shrivastava, BDS MDS Prosthodontist, Certified Digital...
