Q. What should a proper assessment include?

Your dentist will check for things like enamel thickness, receding gums, existing sensitivity, existing tooth decay, existing restorations (e.g. fillings, crowns and veneers), any other oral diseases or conditions. He will also assess the cause of discolouration, (e.g. diet, ageing etc.) and whether it is on the surface or inside the teeth. Only a qualified dentist is able to carry out these checks and then recommend a suitable whitening treatment.