Sweet tooth with something particularly sensitive to the sense of pain and

Past six months, as long as the teeth to eat something sweet and feel pain, long ago in the county People's Hospital dental examination, the doctor said, the right side of a tooth of a small cave there. The doctor said the small cave is too small, poor repair. 1, please suggest me how to treat is. 2, I eat what drug prevention and treatment.Sweet tooth with something particularly sensitive to the sense of pain and