The picture is not clear. Generally, the deeper a tooth cuts into the subgingival space (the gum is the meat next to the tooth), the less likely it is to remain. First of all, half of the teeth inside must be pulled out, and the remaining teeth are expected to remain as long as the depth of the split part is less than 4 mm, otherwise it is recommended that you pull them out as soon as possible. Over time, it will cause local inflammation. It can be recovered in about 3 months after tooth extraction. You can choose 1. The correct diagnosis and treatment plan also requires the doctor to ask you about the medical history of this tooth carefully, and to carry out cold and hot tests and percussion tests on the tooth. If there is no positive indication (meaning no pain), there is no need for root canal treatment.

If the cracked part of this tooth is not deep below the gum, it can still be preserved.

If the tooth is cracked now, I suggest that you do crown restoration as soon as possible, protect it and prevent it from falling off, and don't eat the hard object of this tooth for a few days before the crown is completed to prevent the crown from splitting. I wish you an early relief from your troubles! Through your description, I suggest you repair the post crown.

I hope your teeth will recover soon. If you have any other questions, I am willing to continue to answer them for you!