Hehe, the front teeth are black, which means two problems. One is that your teeth have been treated, and the other is that your teeth may have nerve necrosis and need treatment. If the treatment is completed, you can wrap your so-called crown on the black tooth. You need to grind your black teeth smaller to make room for your sleeves. This situation won't hurt if it feels like your teeth. If it's really treated, it's covered. In order to better protect your teeth, without nerves, teeth will become fragile. It's not good for the front teeth to be black. I don't know how to explain it. If there is anything you don't understand, you can consult me again. I hope I can help you.