Originally Posted by kiki lou
Hydrogen peroxide is FINE to use in your mouth. My bottle even recommends it for oral hygiene purposes. Since it is so mild, it's likely to not do much for whitening purposes, tho. However, my mouth sure feels clean after rinsing with it.
Don't worry! It won't damage your gums!
There seems to be some controversy about that... it depends on the concentrations. Most people agree the lower the concentration the less riskier is its use. >%6 should be OK.
For your info, many countries in europe and some in the far east have banned the selling of hydrogen peroxide solutions to the general public of anything higher than 0.1%! I could find brief info on the net that says hydrogen peroxide should not be used on a regular basis in the mouth and one should be very cautious not to swallow or have it touch his/her eyes because it can cause serious irritation.
On the other hand interested persons claim it is totally safe to use even in high concentrations.
I personally tend to support the first opinion as mentioned above.