Can teeth darken after tooth whitening?
A. It depends on how they are whitened. The same process that lets us bleach teeth can let them darken again. Teeth are permeable. That means stains can go in and out. Generally teeth that have been bleached will darken a little over time but it would take at least several years for them to return to their original color. If the teeth are whitened with veneers or crowns, they will not darken significantly at all. Q. If teeth do darken after whitening, what can I do? A. If they darken more than you want, you can them again. As long as you save your models and bleaching trays, you can do a touch up bleaching for a few days at any time in the future by purchasing an inexpensive touch-up kit of bleach material.
