Smoking cessation generally does not cause toothache, the cause of toothache may be caries, pulpitis, apical periodontitis and other diseases, as follows. 1. Caries: dental defects occur in the hard tissues of the teeth under the action of bacteria and other factors, and deeper cavities can cause pain when cold water or food is inserted into the cavity. 2. Pulpitis: after inflammation of the pulp tissue, because of the high pressure in the pulp cavity and the chemical effect of inflammatory factors, resulting in tooth pain symptoms, acute pulpitis can be manifested as spontaneous pain, paroxysmal pain, pain at night, chronic pulpitis can be manifested as spontaneous dull pain. 3. Periapical inflammation: inflammation of the periapical tissues, generally manifested as tooth biting pain, can also be accompanied by gum swelling and pain. There may be other reasons for the toothache, it is recommended to go to the hospital in time, after clarifying the cause of the targeted treatment.