This spring, the Medical Marijuana Caregivers of Maine joined the usual coalition of anti-pot forces that includes active law-enforcement groups, social conservatives and public health advocates to oppose a state bill that would legalize possession of small quantities of the drug.
And it's not a good idea to use it as mouthwash. Hydrogen peroxide (in dilute form) is used as a tooth whitener (check the active ingredients on those gel-based tooth whiteners, they usually use H2O2). It also has the side effect of turning your gums pale temporarily, though it wears off in a few hours.
But a benefit of the foaming action is that hydrogen peroxide acts as a cleaning agent, bringing any embedded dirt up to the surface. H2O2 is present in trace amounts in honey, which is why before the advent of modern chemical preparation methods, honey used to be used for dressing wounds.