Why Pain Is a Poor Guide
People routinely decide how serious a break is by how much it hurts, and that is unreliable. Whether a break hurts depends on whether it has reached the nerve, which is not the same as how much of the tooth has gone.
A tooth can be fractured vertically through the root, which is often the worst possible break, and feel like nothing at all until infection develops weeks later. Meanwhile a tiny exposure of dentine can be extremely sensitive.
So treat the appearance of the break as the guide rather than the sensation.