The first thing you need to do is to remove the embedded food from the back socket and treat the decayed tooth if it is present. The pain that keeps on hurting after having a back tooth impaction is usually caused by food impaction, which is commonly seen in large gaps between teeth, gingival papillitis, caries, etc. The first thing you need to do is to rinse and brush your teeth repeatedly or floss to remove the impaction. First of all, you need to rinse, brush or floss repeatedly to remove the embedded food. 1. If the gingival papillae are inflamed, you need to use saline and hydrogen peroxide solution alternately for local rinsing and topical iodized glycerin. 2. The development of dental caries to a certain extent, will lead to teeth with cavities, food debris in the cavity to stimulate the pulp tissue, so the symptoms of pain. It is necessary to remove the food debris and deteriorated tooth tissue in the cavity first, and then use filling materials for repair, and if combined with the infection of the pulp tissue, it is also necessary to do root canal treatment. Posterior groove tooth plugging after removing the embedded material and still keep on hurting, you should go to the hospital in time, under the guidance of the doctor to deal with, the drug must also be used in accordance with the doctor’s instructions.