Tongue all cracks may be a normal phenomenon, it may also be grooved tongue. The surface of the tongue is not smooth and flat, but has longitudinal and transverse grooves at the back of the tongue, and usually there are no symptoms, so it can be observed without treatment, and oral hygiene can be maintained. When furrowed tongue occurs, there can be deep and long cracks at the back of the tongue, sometimes reaching the bottom of the tongue. Due to the deep fissure, it is not easy to remove the food residue or bacterial accumulation, and sometimes it will be combined with fungal infection, local inflammatory reaction, such as pain, redness and swelling, etc., you need to use mouthwash to gargle, rinse, clean up the food residue in the fissure; if there is a fungal infection, you can use antifungal medication under the guidance of a doctor, such as oral fluconazole tablets. Therefore, the tongue is full of cracks without symptoms can be observed, there is a painful reaction is mostly seen in the grooved tongue. You can go to the stomatology department for medical treatment.