Because whitening first does what the corrector basically puts out the crown of the tooth whitening the value?
The effect of correction is very clear although the process is very long and the effect is not obvious and there is damage to the teeth
If you care about the color of your teeth, you can consider making porcelain teeth. In fact, many of the star's front teeth are porcelain
But everything has advantages and disadvantages to make the porcelain tooth is a kind of damage to the teeth
