There is a hollow cavity in the middle of the tooth, with nerves and blood vessels in the middle.

If the crack directly cracks to the root of the tooth, it is likely to be lost and must be pulled out.

If the crack reaches the pulp cavity, bacteria will enter the pulp cavity and cause pulpitis. It hurts when it attacks.

If it doesn't break into the medullary cavity, it can't be careless. You should protect it and get a bracket to prevent the development of cracks.

I suggest you go to the hospital and ask the doctor.