thanks...and hmm...that's probably true since it's acid lol...but a lot of people dilute it w/ water and/or juice so that probably helps
Using it as a mouth rinse you have to dilute it (or at least it's extremely recommended to do so)
and I don't think it's suggested using it as a mouth wash for more than like 2 weeks because of how acidic it is. it's only for short term use I think - but its supposed to make your teeth really white