Below is a link to an article and video in which a dentist gives advice on tooth whitening. Needless to say he recommends using a dentist but it is interesting nevertheless.
Teeth Whitening Tips from Dr. Bryan Dunlap – KARK.com
KARK, on Tue, 16 Apr 2013 06:11:20 -0700
He or she can give you tips on whether whitening is what you need. If you’ve had fillings or bonding in your front teeth, for example, the color of those materials won’t match your other whitened teeth. If your teeth are simply yellow, they will …