The need to clean the tongue depends on the specific condition of the tongue. A normal tongue does not need to be cleaned intentionally, while an abnormal tongue needs to be cleaned. A normal tongue should be pink in color and covered with a light white layer of moss. If the color of the tongue changes, if it becomes yellow or if there is an odor in the morning, the tongue needs to be cleaned promptly. If the color of the tongue is abnormal, or if the odor is not cleaned in time, bacteria will grow in the mouth and gradually erode the teeth, gums and throat, causing bad breath and, in serious cases, oral or respiratory diseases. When the tongue is yellow and thick, you can use a soft-bristled toothbrush to gently brush from the root of the tongue to the tip of the tongue, do not use too much force, otherwise it will stimulate the tongue, after brushing, you can use salt water rinse, if necessary, you can use chlorhexidine mouthwash, to maintain oral hygiene, clean the tongue is more beneficial. If the tongue is normal, although there is no need to purposely clean it, you still need to brush your teeth in the morning and evening to keep your mouth clean and keep the tongue in a normal state.