Good morning shubhm,
Have a wonderful day ahead.. Well if itz 3rd molar then better to get extracted or removed, if the caries are not to deep n painless u can restore by filling the cavity post removal of caries by doctor.. *there is no such toothpaste or medicine to fix the cavity or fill it!.. Use of good tooth paste n maintaining good oral hygiene can avoid future cavities.. Before itz too late get consulted by near by doctor.. For treatment
Next Steps
3rd molar regions are usually difficult for brushing as itz in accessible.. area.. Gargling can remove any deposit of food particles. Proper brushing technique is must n good oral hygiene to avoid further damage..
Health Tips
Takecare..