DBC, Auckland.

I was put onto this mouthwash formula by a customer in our pharmacy. Buy a bottle of 3% Hydrogen Peroxide (weakest) from your pharmacy (about $5) and put a capful (approx.1 teaspoon) in small glass of warm water and gargle. It works just as well as expensive Listerine etc and lasts three times as long. It makes sense because all the all time recipes used hydrogen peroxide.