If you have a cracked tooth that is painful all the time, you can choose composite resin filling, root canal treatment, extraction and other treatment measures according to the situation. 1. Composite resin filling: The gap in the large cracked tooth reaches the dentin, causing tooth sensitivity and pain, and composite resin filling is applied to the tooth to make the tooth pain symptoms disappear gradually. 2. Root canal treatment: A cracked tooth can cause the nerve to be exposed or the root tip of the tooth to be fractured, which can also cause the tooth to be in pain all the time. It is best to carry out root canal treatment on the tooth, and then restore the tooth with a crown after two weeks when the tooth is not in pain. 3. Extraction: If the root of the tooth is fractured due to a cracked tooth, it is not meaningful to keep the tooth, so it is best to extract the tooth and restore it with dental implants or other prosthetic restorations at a later stage. The tooth cracked a large gap, should be timely to the hospital, analyze the causes of toothache and then symptomatic treatment, so as not to delay the condition.