Namaste,
There may be severe pain in the concerned tooth due to infection & requires medicines along with Treatment for limited period &in your case, it has been under the right path to have painless tooth ; but it take some time for body to adapt to it & to respond positively.
Next Steps
take the prescribed medicines for the alloted time after meals & maintain dental appointment given by the dentist.
Health Tips
don't chew anything from that side till the treatment is over.
rinse with lukewarm salt water after every meals to maintain oral hygiene.
Thanks!