What does mouthwash mean?
Mouthwash is a liquid preparation for rinsing the mouth. It is commonly swished around the teeth and gums and then spat out, often after brushing, with the aim of freshening the breath, cleaning the mouth, or maintaining oral hygiene. Some varieties contain antiseptic or antibacterial ingredients intended to reduce bacteria, while others are primarily cosmetic breath fresheners. Mouthwash is a familiar household and bathroom product, but it is also familiar in dental and medical contexts, where recommendations may depend on the type of formulation and a person’s oral-health needs. The word reflects its straightforward meaning: it is a wash or cleansing liquid for the mouth. Although it cannot replace brushing and flossing, it can form part of a broader oral-care routine. Its immediate associations are freshness, cleanliness, and routine personal hygiene.
nounA liquid preparation used to rinse the mouth, freshen the breath, and help reduce bacteria or maintain oral hygiene. It is often used after brushing and may contain antiseptic, antibacterial, or flavoring ingredients.
- A liquid used to rinse the mouth for fresh breath, cleanliness, or oral hygiene.
"She rinsed with mouthwash before leaving the house."
"He poured a small amount of mouthwash into the cup and swished it around his mouth."
"The dentist recommended using mouthwash as part of her daily oral-hygiene routine."
Usually used as a mass noun for the liquid. The plural is possible when referring to separate products or containers.
"The shop displayed several mouthwashes beside the toothbrushes."
Mouthwash does more than freshen the breath: antiseptic versions are designed to reduce the bacterial load in the mouth.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mouthwash come from?
Mouthwash is a native English compound of mouth + wash, literally “a wash or cleansing liquid for the mouth.” The compound belongs to the tradition of English compounds that name a washing or cleansing product by combining an object with wash.
How mouthwash is actually used
The word is neutral and everyday. It is usually treated as a mass noun when referring to the liquid, though plural forms can refer to separate products or containers.