6-year-old children often have thick tongue coating, considering that there may be indigestion, upper respiratory tract infections, oral infections. 1. Indigestion: when indigestion occurs, it can be manifested as thick tongue coating, the color is relatively white, at this time, pay attention to diet, do not eat too full, do not eat too much greasy food, pay attention to diet clear. 2. Upper respiratory tract infection: When upper respiratory tract infection occurs, due to cold and other reasons can lead to tongue coating white, it is recommended to pay attention to drink more water, pay attention to keep warm, usually will gradually recover. 3. oral infection: oral infection, such as oral flora imbalance, or patients with oral fungal infections, can lead to white tongue, it is recommended to pay attention to morning and evening brushing, gargling after meals, drink more warm water. 6-year-old children often thick tongue, there may also be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.