Tooth filling needs to be registered with the Department of Endodontics or the Department of General Dentistry. Generally speaking, tooth filling is a treatment for the damage of hard tissues of teeth caused by tooth decay. Tooth decay is caused by bacteria, if the oral hygiene habit is not good, love to eat sweet food, improper cleaning, it is easy to cause tooth decay. It is recommended to go to the dental endodontics department as soon as possible, and fill the tooth after removing the decayed material, so that the caries will not be aggravated and invade the pulp cavity and cause the symptoms of pulpitis. If it has caused pulpitis, resulting in paroxysmal and spontaneous pain, as well as pain from hot and cold stimulation and worsening pain at night, it is recommended to do root canal treatment to remove the infected pulp and prepare the root canal, clean and disinfect it, and finally filling treatment instead of filling the tooth directly.