There are many causes of toothache: ①Caries: Generally, early caries has no symptoms. However, when the caries cavity becomes larger and deeper, it may cause toothache during eating. The pain worsens when eating sweet food or food that is too cold or too hot. In this case, you can first use anti-acid and analgesic toothpaste and brush your teeth with warm water. But the effective treatment method should be filling the caries cavity. ②Pulpitis: It is mostly caused by pulp infection due to deep caries without filling, or chemical drugs or temperature stimulation, which causes spontaneous and paroxysmal severe pain, cold and heat stimulation pain, and percussion pain. For emergency treatment of this kind of toothache, you can take Fenbid 300mg orally, twice a day for analgesia. The radical cure method is pulp therapy under local anesthesia. ③Apical periodontitis: It is mostly caused by the spread of pulpitis to the root canal orifice, leading to inflammation of the periapical tissues. It is characterized by persistent toothache. The affected tooth feels elongated, with obvious touch and pressure pain, and cannot bite food. At this time, you can take anti-inflammatory and analgesic drugs, such as Cefalexin No.4 0.5g, three times a day; Metronidazole 0.4g, three times a day; Indomethacin 25mg, three times a day, and eat soft food. After the inflammation subsides, root canal treatment can be performed. ④Dental trauma: Tooth fracture or tooth cracking caused by accidental falls, bumps, or biting sand particles while eating can lead to toothache. You can first take anti-inflammatory and analgesic drugs, and if possible, go to the dental department for treatment. ⑤Pericoronitis: Difficult eruption of wisdom teeth (impaction) combined with poor oral hygiene can cause inflammation, swelling, and pain around the tooth crown. You can rinse your mouth with rinsing solutions like Koutai or Koushu, and take anti-inflammatory and analgesic drugs. After the inflammation subsides, the impacted tooth can be extracted. In addition, influenza, jaw cysts or tumors, hypertension, heart disease, etc., sometimes can also cause toothache.