You may have deep caries, which require immediate treatment.
Next Steps
(-) Visit a dentist or consult online
(-) Try to maintain good oral hygiene, by brushing twice a day, rinse thoroughly whenever you eat something, brush twice a day
(-) Warm saline water rinses
(-) You can take painkiller, but remember that painkiller will give temporary relieve only
Health Tips
x ray is required to diagnose the extent of cavity.
stay safe n healthy