A crown and a filling solve different problems, and mixing them up is where most of the confusion starts. A filling works when there's still enough healthy tooth structure left to build around. A crown comes into play when there isn't. You've lost too much structure, or what's left is starting to break down, and the tooth needs to be capped rather than patched.

Where this gets misunderstood most is timing. A crack in a tooth, caught early, is something a crown can usually fix. Left alone, that crack keeps spreading. Bacteria works its way in, irritates the nerve, and what could have been a straightforward crown turns into a root canal, or in the worst cases, an implant, because the fracture went too deep to save the tooth around it.

The instinct to wait makes sense on the surface. If it's not bothering you, it doesn't feel urgent. But a crack doesn't pause because it isn't hurting yet. Neither does a cavity or a worn-down filling. They keep moving whether you feel them or not. Catching it early is usually the difference between a crown and a much bigger conversation.