Unfortunately, dental bondings, composite resin fillings (tooth colored fillings) and old crowns cannot be bleached. Fillings that have discolored indicate that they are either leaking or have secondary decay, so it is best to replace them. A better choice may be to replace them with porcelain laminate/veneers for longer lasting results. Remember; only replace these fillings after bleaching in order to match the new improved color of your teeth. “How long does bleaching or laser teeth whitening really last?”
It depends on many factors including your diet, the original color of your teeth, and your personal habits like smoking, drinking red wine, etc. Also darker teeth will need more than one whitening session to achieve the desired result. What’s most important is what you do for maintenance. Professional office visits are not enough. You must incorporate an effective maintenance regimen at home such as using whitening toothpaste which is specifically designed to non-abrasively remove surface stains like coffee, tea, tobacco and red wine, as well as remove plaque and bacteria. Also use the touch up kit given by your dentist to keep bleached teeth at their whitest.