Hello ... The second molar requires an RCT primarily ... keeping the long term solution in mind it is better to go for RCT for the first molar also and give crowns to both the teeth together to avoid further food impaction there .
Next Steps
See your dentist at the earliest so that the infection doesn't reach the bone which will bring down the success rate of the RCT
Health Tips
DO NOT apply any balms or hot pack there ... it will aggravate the pain