Large teeth cracked, may be due to the bite stress concentration caused, generally due to the tooth itself has a hidden crack and not timely found, or found not timely treatment, so then bite hard objects or stress concentration will easily appear large teeth cracked phenomenon. In the event of a hidden crack, the tooth should be filled and examined in a timely manner, and if the eye crack is deep, porcelain braces can be restored, which can prevent tooth splitting and reduce the degree of tooth sensitivity. In addition, if the tooth has been root canal treatment, removal of the nerve, the tooth is particularly fragile due to the lack of nutrient supply, it is easy to lose teeth or piece by piece down the phenomenon, so when the treatment of teeth after the need to do braces repair, a porcelain braces, so as to prevent the splitting of teeth, if not do braces, it is easy to crack the phenomenon of large teeth.