Dry mouth and cracked tongue may be due to open-mouth breathing, dry syndrome, digestive disorders, etc. It can be treated by adjusting diet and medication (e.g. glucocorticoids, probiotics). 1. Open-mouth breathing: patients may be due to long-term open-mouth breathing and other reasons leading to excessive evaporation of water, saliva reduction, thus causing dry mouth, tongue cracking, such a situation requires patients to improve the habit of sleeping with the mouth open to breathe, drink plenty of water, avoid spicy stimulating food for a period of time can be improved. 2. Dry syndrome: patients in this situation need artificial saliva to alleviate the situation of dry mouth and cracked tongue, if necessary, need to use glucocorticoids and other drugs to treat. 3. Digestive disorders: patients may be due to recent overeating and eating too much spicy and stimulating food leading to digestive disorders, which in turn cause dry mouth and cracked tongue, patients need to improve their diet, portioning several times to drink warm water, and take probiotics and other medications if necessary, the situation can be improved after a period of time. In addition, gingivitis, periodontitis, etc. can also cause dry mouth and tongue cracking, it is recommended that once the patient found a similar situation in a timely manner to the doctor, under the guidance of the doctor to take targeted measures. In addition, if you need to use drugs should be used under the guidance of a doctor, do not blindly use drugs.