Erosion is the destruction of the hard tissue of the tooth by chemical factors. Progressive consumption of the dental structure, as result of the chemical processes actions, undefended of the micro-organisms, bacterial flora in oral cavity [1]. Chemical consumption happens when the teeth are exposed for a long time under the acidity of the dissolution. Two are the causing of the erosion: external and internal factors, which are etiological factors in charge for dental system. Fizzy drink consumption, conserved drink consumption, different wines consumption, acetous food consumption are main external factors for erosion phenomena, while the chronically gastro-intestinal disorders, continuity of unappetizing of the individual, bulimia, regurgitimi, and vomits are interior factors for erosion of dental system. Usually, the erosion potency of the acidic fizzy will serve as jumping of place for demineralization and losing of the dental structure, and for that reasons, the dental erosion appearance should appreciate as well by using of the medicaments with P^H acidity (like C vitamin, aspirin etc.,) which are continually in contact with tooth surface.

In dental practice the chemical and bacteriological factors are determined elements for generation of erosion.

The foods and acidity of the fizzy drinks give contact with superficial glaze of the tooth diffusing into the its layer, creating for chemical agent an opportunity to intervene in reaction with mineral content of the layer tooth like as hydroxyl apatite of the glaze. The erosion capability of the acidity of fizzy drink, do not totally depended by its P^H, but it is affected as well by two other factors: 1] dissobility of the content acid in its buffered capability and, 2] the capability of decay to the of the Calcium (Ca), as well as, the new affinity to create free ions. As higher the buffered capability of the fizzy drinks, so longer need by saliva for neutralization of the acidity [2].

Mainly the biological factors have effects over the saliva, the tooth content and its anatomic structure, which are followed by biological protection capability of the saliva against corrosion including by such phenomena’s: a] dissolution and removal of corrosive substances from mouth, b] neutralization (buffering) of acid’s, because saliva minimize corrosion through neutralization of acid’s favoring re-mineralization by securing the Ca⁺²; PO₄^-3 ions, c] providing the necessary Ca, P, F for re-mineralization. In this case, saliva over the tooth surface established a cuticle that has protection effect against de-mineralization action of acid, damaging of this cuticle from fizzy – acids of drinks and destroying its protection capability, creating more opportunity to speed up the corrosion process. Generally, as lower the buffering capability of saliva, so higher is erosion process over the dental system [3].  Consumption of conservation fruits drinks, fizzy drinks, vegetarian foods produce erosion effects over the teeth, which bring dentinal changes, like as aperture of dentinal tubules, which are more sensible against the external irritations creating strong pains.

According the hydrodynamic theory, an irritation by acid applied over the tooth surface, discovering dentinal tubules, which are associative with moving of fluids among their, changing the pressure at mechanical receptors of dentinal alpha-beta or alpha –delta fibers. This change of moving of fluids is perception as a sharp pain at the patients. The dentinal hypersensitivity is a primary phenomenon of the teeth erosion.

The erosion of the tooth consumption is considered as a pathological phenomenon, when is shown at an unacceptable level for its consumption. Evaluation, if the teeth consumption is pathological phenomena or not, was depended by same factors: by the consumption scale; by the patient’s demand for the dentinal over sensibility; by the age of the patient. Clinically was shown, not only the enamel exposure, but the dentine also, which is associative with an over stress sensibility as were shown in our patients study photos [1,2].