Gingivitis can be treated with hydrogen peroxide mouthwash, as hydrogen peroxide is a colorless liquid with an irritating odor, and medically, it is commonly used for disinfecting wounds and otitis media. When the skin is infected or there are wounds and pus or contamination in the oral mucosa, 3% hydrogen peroxide can be used for disinfection, as it can destroy the bodies of bacteria and kill them. During oral treatment, such as some root canal treatments, hydrogen peroxide can be used for rinsing because most oral infections originate from anaerobic bacteria, and hydrogen peroxide has a strong bactericidal effect. However, as hydrogen peroxide is a topical medication, care should be taken not to swallow it while using it for mouthwash.