Seattle Teeth Whitening doctors

The only way to prove the safety of teeth whitening is to demonstrate test patients for research studies.  However, getting pregnant women or young children to participate is both a legal and ethical challenge (ie, what if something coincidentally went wrong with a baby or child, would the whitening be blamed?).

The reality is, bleaching is safe.  The youngest I have ever done was on my own children at age 10, as most kids younger than that were simply not interested.  Most start to be concerned about their overall appearance at around age 12, so that is when most requests start.

The best methods include dentist input, as most over the counter/internet products are unregulated and unmonitored.  To be safe, dental supervision is suggested.

While the porcelain on the crown is weakened (it's already chipped...) it is very unlikely that an impression will chip it further.  So I would not worry about that, but would not be surprised to see more chipping in the future.  Also, be forewarned that bleaching your teeth may not give them the same shade as the porcelain crowns.  Unless, that is, the crowns were made to match teeth that had been bleached shortley before the crowns were made.  In that case, bleaching should restore the original color match.