Dry heaving when brushing teeth can be caused by improper brushing method, which should be changed, and if it is caused by chronic pharyngitis, it can be treated with gargle solution. Dry heaving when brushing teeth can be caused by improper brushing, such as brushing teeth with too much toothpaste foam, which will stimulate the local nerves and cause dry heaving reaction, you can choose less foam toothpaste. In addition, if there is chronic pharyngitis, there will also be dry heaving when brushing teeth, accompanied by foreign body sensation in the pharynx, pharyngeal itching, etc., you can use compound borax solution, furacilin solution, chlorhexidine gargle solution and other drugs for gargling. If the phenomenon of brushing teeth and dry heaving occurs frequently, you should go to the hospital in a timely manner, the use of the above drugs need to follow the doctor’s instructions.