It looks like affected tooth has caries.. Which seems to be infecting roots and beyond. You will need to get the definitive treatment done as tooth has to survive for around 5 years but let the amidst pandemic become less aggressive.. Till then antibiotics and pain killers will help
Next Steps
consult a dentist online for details prescription
Health Tips
avoid applying heat, Vicks, balm, iodex, to the affected area.. ice application can be done