I believe the active ingredient used in teeth whitening gels when used in a mould on the teeth is hydrogen peroxide. I wish to know what percentage is used.

Is it really effective?
Is gargling it like mouth wash the best method of using it?
How often is it safe to do so?
Will it harm my teeth?

So I heard that you can whiten your teeth with hydrogen peroxide and to apply it about 2-3 times a day
I have school pictures in 2 weeks and my teeth aren’t very bright.
but my question is for how long should i leave it in for?
and have you tried this? if you did how did [...]

Does that actually work??? What does work for whitening your teeth besides that?

where can i buy the strongest hydrogen peroxide to whiten my teeth? i have seen the bottles but they are only like 3%.
thanks

What are some other teeth whitening at home remedies? Whats the best one? If i were to do Hydrogen Peroxide+Baking soda, how much of each? How much should i do it?

to let the peroxide sit on my teeth overnight. Is there any damage that is being done to my teeth?

Does hydrogen peroxide work better then baking soda in whitening the teeth?
also .. where can i buy it and how much is it ?
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