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Since you have got erosion of the outer layer of your teeth it leads to exposing of the nerve
endings causing pain.
This pain can come on with intake of cold
or hot food and drink.
This is called sensitivity of tooth.
The pain if severe can radiate to the surrounding areas like cheek and the reason is that they have common nerve supply.
To reduce pain you can use tooth paste like Sensodyne
rapid and it will reduce the sensitivity.
This will help to some extent but for complete treatment you need to consult a dentist
and he will do the needful.