A normal tongue is a light red tongue with thin white moss. If a light thin white layer is flushed on the tongue, it means it is a normal tongue moss. If the tongue becomes yellowish and yellow thick, consider that there is damp heat in the spleen and stomach, damp heat is disturbed internally and damp heat smolders upward, only then will yellowish moss or yellow thick moss appear. In this case, you need to control your diet, reduce the intake of fatty, sweet, thick and greasy meat, and strengthen your physical exercise. If the tongue is covered with white greasy moss or white thick moss, it is considered that dampness and turbidity are blocking or cold dampness is invading the spleen and stomach, which causes water dampness not to transform, resulting in white greasy moss or white thick moss. You should warm the Yang and strengthen the spleen, eat more foods that strengthen the spleen and stomach, and reduce the intake of fatty, sweet, greasy and indigestible foods. Try to reduce staying up late at night, and the symptoms can only be improved through diet and indigestible food control, and through the identification and regulation of Chinese medicine.