Most of the teeth grinding at night, especially in children, is caused by parasites, so you can see a pediatrician and may need to take some anthelmintic medicine; most of the teeth grinding in the elderly is caused by some neurological diseases, such as Parkinson’s disease or other neurological diseases, which can occur at night, and you need to find a neurologist for diagnosis as well. Mild teeth grinding generally does not have a great impact on the body, but if frequent teeth grinding affects rest, or leads to a serious situation such as tongue bite, you should be diagnosed as soon as possible.