There can be two reasons for it:
1. Caries
2. Periodontal pocket/bone loss
Get ur checkup done. If it is caries, you need to get ur tooth restored. And if it is due to pocket, profession cleaning of tooth( scaling and curretage) is required. Then you need to maintain your oral hygiene.
Answered2017-12-08 07:00:13
Let others know if this answer was helpful