There are often various food residues left between the teeth of the mouth after meals, which can generate protein toxins, nitrites and other carcinogens by the action of biological enzymes and bacteria in the mouth. These substances will enter the digestive tract through oral movements such as drinking, eating, and swallowing saliva, endangering the body. Rinsing your mouth with tea after meals will inhibit the growth of bacteria between your teeth by using the fluoride ions and tea polyphenols in tea. The tea also has an anti-inflammatory effect and inhibition of E. coli and staphylococcus multiplication. The tea will contract and release the meat fibers embedded in the teeth. Therefore, rinsing your mouth with tea after meals is good for your health, especially after a full meal of grease.