Get the intraoral x ray done,let the dentist decide the extent of cavity , then get the treatment done,but as u r saying ,it may need Root Canal procedure.

u mean cavities...u need t get filling done

Going by the description that you have mentioned it seems that you have a deep cavity in your tooth which needs to be evaluated properly through a proper clinical set up as well as an xray. The treatment can range from a simple filling to root canal treatment depending upon that analysis. Delaying the treatment will definitely not be recommended as it can cause the symptoms to aggravate further. Regards.

Need to get the X-ray of that tooth! Depending on how deep is the cavity - filling or Root canal would be the treatment recommended. Go ahead with what’s best for you .