There are many clinical causes of tooth pain such as: first, decay, when the hot and cold stimulus stimulates the cavity, it will cause a transient pain in the pulp, the pain is very short, when the stimulus is removed the pain can disappear. In acute pulpitis, the inflamed nerve exudate is too much and cannot be effectively released to cause severe pain, which is often unbearable. In chronic pulpitis, the patient has a long history of toothache with an irregular dull ache, and the location of the affected tooth can often be determined. The fourth, periodontal disease, such as periodontal abscesses and gum abscesses can also cause dull pain and require treatment at a regular dental hospital.