Toothache in the elderly may be caused by periodontitis, a large proportion of the elderly population has symptoms of periodontitis, and the advanced stage of periodontitis causes the roots of the teeth to be exposed in the oral cavity due to the resorption of the alveolar bone. More serious periodontal disease may also cause retrograde pulp infection resulting in retrograde pulpitis, which leads to severe pain in the teeth. The roots of the teeth of the elderly are exposed in the oral cavity, and the root surface of the teeth will be easily decayed, because the tissues at the root are not as hard as the enamel, once the decay occurs, it will progress very rapidly, and will soon develop into pulpitis, which will also cause pain. Older people will have the phenomenon of gradually increasing the gap between the teeth, which will lead to food embedment, and if it is not cleaned in time, it will lead to the inflammation of the gum papilla, which will also cause tooth pain. If tooth decay occurs in the elderly and is not treated in time, it will develop into pulpitis or periodontitis, which is also one of the causes of toothache in the elderly.