When eight-year-old children have toothache, treatment measures can be taken according to the specific situation, as follows: 1.Because children are in the period of permanent tooth replacement, the dental arch is constantly expanding, and there are more gaps in the dental row, which are easy to embed food residues and cause swelling and pain in the gums, you can apply dental floss, flosser, etc. to remove the stagnant food fibers and apply iodine glycerin to speed up the inflammation. 2.If cavities are formed in the milk teeth, you can use glass 3.When pulpitis and periapical inflammation occur in the milk molar, root canal treatment can be carried out to prolong the service life of the milk tooth and wait for the eruption of permanent tooth. 4.When the newly erupted permanent tooth produces deep cavity and irritates pain when it encounters cold, hot, acid and sweet, calcium hydroxide can be used to pad the cavity after removing the decaying matter, and then composite resin or silver amalgam can be used to fill it.