Rinse your mouth with tea after meals: Health tea is rich in alkaline substances, and its functions of decontamination, deodorization and degreasing are far stronger than ordinary water. After three meals a day, especially after eating fish and delicious wine, gargling with tea can clean the mouth, remove the fishy smell and greasy. Tea can also kill some bacteria in the mouth and prevent oral inflammation. Tea can also deodorize, especially wine, cigarettes and garlic.