Colgate Peroxyl Oral Cleaner is mint flavoured and alcohol free, with oxygenating cleansing action.Colgate Peroxyl Oral Cleanser is a ready-mixed, mint flavoured oral cleanser, containing hydrogen peroxide 1.5% w/v. When Peroxyl comes into contact with mouth tissue, oxygen is released in a pleasant bubbling action. This provides mechanical cleansing which flushes out mouth debris.