Bad breath can have many causes, and tongue coating is one common daily hygiene issue. Mouthwash may provide a feeling of freshness, but it does not mechanically clean the tongue surface.
Why clean the tongue?
Residue and coating can accumulate on its surface. Gentle, regular cleaning is one part of complete oral hygiene.
The role of mouthwash
Depending on the formula, mouthwash can complement the routine. You should not expect it alone to solve persistent bad breath.
The best approach
Brush the teeth, clean between them and clean the tongue, and stay adequately hydrated. If the problem remains despite good hygiene, consult a dentist.
See also whether mouthwash removes or only masks bad breath.
