professional teeth whitening kits 35%hp teeth whitening kits cmes with gum-protector and desensitizer easy mixed and use. In-office whitening kit,Made in USA #1 choice among dentists,professional 35%hydrogen perocide.Easy to use and errective single patient kit. Contents:Gum protector,1 syringe HP gel 1 syringe activator.Including desensitizer/remineralisation gel.Shelif life one year Therapy range: 1.Extirnsic tooth discoloration)addected by cooffee,tobacco,sauce,tea,food,etc) 2.Intrinsic tooth discoloration(e.g.mild fluorosis or trtracycline staining) 3.Genetically yellow teeth 4.Other cause of teeth discoloration