<unk> (solution) is an antiseptic that is FDA approved for the treatment of removal of secretions associated with sore mouth.   Common adverse reactions include skin irritation, Skin and mucous membranes, hypertrophy of tongue papillae, with prolonged use as mouthwash..
Hydrogen peroxide 
Peroxide
Superoxide
Hydrogen sulfide
Sulfur dioxide
Acrolein
Hydroperoxyl
Dimethyl sulfide