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.
Reviewed By: Mahnaz Fatahzadeh, DMD. An oral rinse (mouth rinse or mouthwash) is a liquid solution that you swish around your entire mouth  teeth, gums and tongue  to help promote oral hygiene, reduce oral discomfort, provide moisture to oral tissues or help with bad breath.