Yotuel dental whitening programme has been developed by dentists without abrasives or detergents to whiten your smile safely 1 2 with proven benefits for enamel and gumsbibliography1 effects of carbamide peroxide containing bleaching agents on the morphology and subsurface hardness of enamel journal of clinical pediatric dentistry ma usa 2001254293 62 the use of qlf to quantify in vitro whitening in a product testing model british dental journal england 200119