[Dental pain].

"The extreme variability of toothache is such that a good rule for any examiner is to consider all pains about the mouth and face to be of dental origin until provide otherwise" (Welden E. Bell). Dental caries is a disease of the calcified tissues of the teeth, characterised by demineralization of the inorganic portion and destruction of the organic substance of the tooth. The acids which affects the primary decalcifications is derived from the fermentation of starches and sugar logged in the retaining centers of the teeth. Dental caries can be classified in relation with the depth of the lesions: caries of the enamel, caries of the dentin, pulp diseases which are the result of dental caries in which bacterial invasion of the dentin and pulp tissue occurs, diseases of the periapical tissues which leads to periapical cyst, or to periapical abcess.