Bleaching helps brighten teeth made dull and yellowed by years of coffee, wine ,tea and smoking.  This can be performed at home by the use of custom fitted mouth trays, which are worn for a period of 30 minutes to a few hours depending on the degree of whiteness desired and the concentration of the bleaching gel.  As an alternative, in office bleaching can be performed for a more immediate result. Please ask what option is best for you.