Cracked tooth syndrome is when you have a tooth (one of your white bones in your mouth) that is cracked or has a break in it. Think of it like cracking a toy car in half, but instead it happens to your tooth. Sometimes it can be hard to see the crack, because it might be very tiny, but it can still cause a lot of pain and problems.
If you have cracked tooth syndrome, you might feel pain when you bite or when you eat something really cold or really hot. You might also feel a sharp pain when you let go after biting something. It's like when you bite into an apple and your tooth hurts a little bit, but with cracked tooth syndrome, it hurts a lot more.
Your tooth can crack for lots of reasons, like biting into something too hard, grinding your teeth, or having a big filling. Sometimes it can happen just because you have weak teeth.
If you think you might have cracked tooth syndrome, you should tell your grown-up to take you to the dentist (a special doctor for teeth) to get it checked. The dentist might fix it by putting a special filling in it, or they might have to fix it by putting a crown (like a special hat for your tooth) on top of it. If the crack is really bad, they might need to remove the tooth and give you a new one.