In general, the main reason is the pain caused by oral diseases, such as dental caries, acute pulpitis, periodontitis, acute and chronic periapical inflammation, dentin hypersensitivity, root fracture or cracked teeth, and so on. Dental caries caused by tooth toothache because there are cavities, encountered the cold, hot, sour, sweet and other stimulation or food impaction cavity and sometimes feel pain. After removal of stimulus, pain can be stopped immediately. Acute pulpitis Dental Instruments caused by toothache, characterized by spontaneous, paroxysmal pain, experiencing hot and cold stimulation or rest at night the pain got worse. Other causes of toothache, although the mechanism is different, but one thing is common, that experience cold, heat stimulation when the pain got worse.
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