Colgate Peroxyl Medicated Mouthwash has been developed to help relieve minor mouth and gum irritations. The medicated mouthwash, with hydrogen peroxide, kills germs and stops them spreading and causing infection. The mouthwash also gets rid of debris in your mouth. What Peroxyl® looks like and contains Peroxyl® is a clear colorless liquid, available in 300 ml bottles.Relieves minor mouth and gum irritations, Medicated mouthwashTake care of minor mouth and gum irritations with Colgate Peroxyl Medicated Mouthwash. This mouthwash with hydrogen peroxide can help to relieve your gums and mouth by killing germs and preventing them from spreading and causing infection. When you use the medicated mouthwash, you’ll experience a bubbling action caused by oxygen being released. This bubbling allows the mouthwash to flush out debris from your mouth and help to relieve minor irritations.