Can I rinse my mouth with water after using mouthwash for half an hour?

Oct 25, 2022 Source: Cainiu Health
Disease description:

I've developed several oral ulcers. After rinsing my mouth with mouthwash for half an hour, my mouth feels slightly numb. Can I rinse with plain water instead?

Doctor's answer (1)
Dr. Zhang Lei
After using mouthwash, you can rinse your mouth with water half an hour later, because the mouthwash may leave residue in the mouth. Frequently swallowing mouthwash may irritate the stomach and could be absorbed through the gastrointestinal tract, potentially affecting the body. For topical oral medications, it is recommended to keep the medication in the mouth for at least 30 minutes before brushing and rinsing.