Usually a tooth sulcus infection or tooth root neuralgia will cause a fever, mainly low to moderate fever, not exceeding 39°C. To determine if a fever is caused by a toothache, it is important to observe the symptoms of toothache, whether the facial skin temperature is elevated, whether the toothache is felt, the nature of the toothache may be jumpy or stuffy, and whether there is redness, swelling, bleeding, or pus around the gums. If there is no damage to the surface of the tooth and no signs of pus, fever is not a major factor in toothache, but may be caused by infection with other diseases due to a decrease in one’s resistance.