Fillings do not hurt before fillings, but after the pain is mainly related to the filling is invasive operation, is a normal phenomenon. Some patients should also be alert to foreign body stimulation, infection and other factors. 1. Normal phenomenon: dental filling is a clinical invasive operation, the filling process usually need to remove decay and other diseased tissues, eliminate the obstacles to the restoration in place, so it will cause stimulation or damage to the local tissues, induced by the phenomenon of filling the teeth before the filling instead of pain after the filling of the phenomenon of pain. 2. Foreign body stimulation: If you take in hard food such as nuts and crabs after filling, it may cause stimulation to the local teeth, thus inducing pain symptoms. 3. Pulp infection: the filling process accidentally penetrate the pulp, or filling body micro-leakage led to caries into the pulp, induced pulp inflammation, this time the need for thorough root canal treatment to cure. It is recommended that those who do not have pain before filling but have pain after filling should consult a doctor for examination, so that treatment measures can be taken in accordance with the doctor’s instructions. The pain can be relieved by applying ice packs locally and taking non-steroidal anti-inflammatory drugs such as ibuprofen and acetaminophen as prescribed by the doctor.