Sometimes, our body shows slow  response in terms of healing after rerct or rct in the periodontium( I. e the tissue surrounding & supporting  the  teeth) & that  healing response is causing you discomfort. So, don't worry about it. Also, I advise you to maintain oral hygiene by following proper oral hygiene instructions as advised by the dentist. Here Rerct is fine. No, any further treatment is necessary. Still,If you feel any discomfort  ,it might be because of slight amount of plaque or tartar built up palataly.