Causes of Tooth Hypersensitivity
If the tooth reacts to temperature changes – it's definitely a pathology. The only question is, which is it, and how difficult it is to cure. In any case, the first thing you should do is contact the dentist. And then there are several options.
Hypersensitivity of Tissues
With focal enamel demineralization, it loses ions of calcium and fluorine, while significantly thinning. This leads to the fact that the layer of sensitive dentin is getting very close to the environment. Hence, sensitivity to hot and cold is significantly increased. 
Hypersensitivity can be characterized as so-called feeling of "soreness of the mouth", familiar to everyone. It is transient and is eliminated almost immediately after the stimulus is removed.
The treatment of such diseases is professional oral hygiene and remineralization therapy. If you need porcelain veneers in Dubai call Dentist Direct Dubai Company!
Caries of the Dentin
When in the tissue of the dentin is involved in the hearth of carious destruction, it immediately starts to hurt from temperature extremes. The tooth responds to hot and cold. Visually you can see a small cavity in the crown. After removal of thermal stimulus pain immediately goes away. Treatment of caries of the dentin is dental sealant, at least – the production of orthopedic crowns.
Pulpitis
If the tooth responds to cold intense with throbbing pain that is not long – it speaks of a chronic pulpitis. All the pulp, and crown and root can be affected by inflammation, and its viability is impossible to restore.
If the reaction is associated only with cold irritation, as a rule, it is chronic fibrous pulpitis. Another form of inflammation of the nerves and vessels of the tooth – acute diffuse pulpitis – can sometimes give a reaction on temperature, but it is characterized by spontaneous pain that spreads into the surrounding tissue.
Treatment of pulpitis is endodontic intervention, the removal of the inflamed pulp and the permanent filling of root canals with gutta-percha.