Crowns are restorations. They cover your teeth like little hats. But instead of keeping your teeth nice and toasty, crowns help rebuild damaged teeth back up to their original shapes and sizes.
You'll most likely need a crown if a tooth breaks down and a filling won't be enough to fix it. If your tooth cracks, a crown will seal the crevices and hold the tooth together so the damage doesn't worsen. If you have a tooth that's not strong enough to support a large filling, a crown can correct that too.
Crowns are also a great solution for attaching bridges and restoring fractured teeth. If you have a tooth that's bothering you because it looks offbeat, a crown can reshape it. And if your teeth are purple, green or some other shade besides tooth-colored, crowns will hide the discoloration.