Salt water does not cure toothache, toothache if it is caused by inflammation of the gums, you can use saline rinse to help anti-inflammatory, other toothache may need to do dental repair, tooth desensitization, treatment of dental nerve, etc., it is recommended to the hospital specific examination and treatment. Gingivitis, pericoronitis can be rinsed with saline around the gums, to remove local irritation and have a certain role in relieving inflammation, can improve toothache. If you have dental caries, you should do dental repair and fill the cavity to relieve the toothache. Dentin allergy can do laser desensitization, drug desensitization and other treatments, commonly used strontium chloride, potassium nitrate and so on. Teeth with pulpitis need to treat the nerve, kill the nerve or take the nerve treatment.