If you have a toothache when having cold things, there may be the following two situations:
 
    One is that you have one of the common oral diseases--dentin hypersensitivity. Dentin hypersensitivity refers to the fact that the teeth are stimulated by external factors, such as the cooling of temperature, the sweet and sour stimulation of chemistry and the friction of mechanical action. Biting hard things can also lead to toothache. The toothache of dentin hypersensitivity is characterized by rapid onset, sharp pain and lasting a short time;
 
    Another situation is that you have dental caries which affect the dental nerve. So when you have cold, hot, sour or sweet things you may have a toothache, then you need to go to the professional dentist to have a check.

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