Dear lybrate-userif there is small cavity you will have to visit nearby dentist and get your teeth filled. If it is very deep you will usually get severe pain as you have mentioned hence it may require root canal treatment. Delaying treatment can result in loss of tooth as saving options will become less.
Cavity has extended to the dental pulp, which is sensitive portion of your teeth.
Rct (root canal treatment) may be required.
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