There are many ways to see cracked teeth, either with x-ray images or just in plain sight you can see it in your mirror. Depending on the type of crack your tooth may have, if the root is infected you can be treated with root canal therapy. In this procedure, the pulp, vessels, nerves, and tooth will be extracted and replaced with gutta-percha to fill the space. For surface cracks, a crown or filling will be placed to stabilize the tooth to function normally.
If the tooth is too damaged and cannot be saved then in this case we would have to extract the tooth completely. But the good news is that there are several restoration options, like your dentist may recommend getting a bridge, dental implant, and partial dentures. With these options, you can go back to chewing, biting, and speaking functions.