Is the pain sensitive to cold/hot?
This may be caused by a decay, cracked tooth, lost filling, erosion or abrasion. Acid erosion and abrasion (usually by excessive brushing) results in the removal of the surface layer of the tooth and may lead to sensitivity. Tooth sensitivity is treated by sealing the exposed parts of the tooth. If a tooth is cracked, there is also sensitivity on biting. A cracked tooth needs a crown which wraps around the tooth, covering the crack and holding the tooth together to prevent further splitting.
Is it sensitive to sweets?
Sensitivity to sweets usually indicates tooth decay. Tooth decay can be easily treated with the removal of decay and the placement of a filling. It is imperative that the decay is treated before it works its way into the nerve of the tooth.