★★★★★
The label on the 3% drug store version says you can use it as an oral debridement but not to drink it. Imo, that label is simply there to protect the manufacturer from being sued by people who think you should be drinking H2O2 like soda or water in massive amounts. It is inevitable that you will ingest a few drops each time you rinse your mouth with H2O2.
Also, don't fret if you can't find 35% solution. You can use a lower concentration but you just have to increase the dosage. E.g. if you get the 12% concentration, then you just triple the number of drops in the same amount of water (3x12%=36%). Same for the 3%. Just multiply by 12 x.
