A. There are a number of whitening systems available on the market – zoom being one of them. The main problem with bleaching is sensitivity issues afterwards. This is usually transient and is rare to last more than a month at the worst. The other issue is the inability to bleach existing restorations. Be prepared to replace any visible restorations if the surrounding teeth become whiter. Finally your mouth need to have healthy gums and no decay present prior to bleaching.