Why does my tooth still hurt after a filling?

Link: https://www.verywellhealth.com/signs-of-gum-disease-4129574

Wychwood Dental's takeaway:

• I always make a point to tell patients all possible issues they may experience after a filling, including sensitivity. Most issues are short in nature but it is always a good idea to let your dentist know if you are experiencing post-op sensitivity. This way you can have all your questions and concerns addressed.
• If the bite feels off after a few days, I always tell the patient to call and come in ASAP. Usually, a slight adjustment is all that is needed and if left untreated can cause more serious problems.