Mouthwashes are commonly used by adults but their use in children is debated as they may contain alcohol which can be harmful if swallowed. While mouthwashes can help reduce bad breath and promote oral health, parents should consult their dentist before letting young children use them due to risks of ingestion. If used, children should only use a pea-sized amount of non-alcohol mouthwash and dilute it with water, and always be supervised by an adult.