Generally, thalidomide is not used to treat mouth ulcers. Except for recurrent mouth ulcers and stubborn mouth ulcers you can try thalidomide tablets. In addition, there are several contraindications to the use of thalidomide tablets that need to be noted: First, it is prohibited for pregnant and lactating women. Secondly, children are prohibited from using it. Third, women who are preparing for pregnancy should stop using thalidomide tablets for at least 6 months. The storm of seal children that once broke out around the world was caused by women who took thalidomide during breastfeeding in order to prevent discomfort during pregnancy, such as vomiting and nausea, which caused abnormal development of fetal limbs and resulted in seal children. Therefore, thalidomide tablets must be used in a balanced manner and used for the treatment of mouth ulcers must be used in strict accordance with the doctor’s or pharmacist’s instructions. Recurrent mouth ulcers are also a problem. It is recommended to keep your mouth clean, rinse it with salt water often, and be rich and diverse in your diet, and children are advised not to be picky eaters. Other medications can also be used to treat mouth ulcers, such as watermelon cream spray when symptoms begin and dexamethasone paste tablets.