Hi Since its deep hole depending on ur symptoms 1.xray for diagnosis 2 root canal  treatment if ur nerve is already exposed or open ,severe pain history 3 filling # if just deep decay without nerve involvement Since its covid Dentist are taking all proper precautions for there patient . No need to get scared .just be aware ur visiting proper standard clinic where all sterilization is taken care of  simple.   Tooth can't repair itself at home .Don't delay else more complications will be coming further Tc

Dear practo user Consult your doctor before it's too late.

Need to visit dentist .

Please rinse with warm water and salt dissolved in it. Avoid sweets now.

You can't do anything at home. Visit a nearby dentist. Until then maintain good oral hygiene.