Hello, we don't judge doctors. In this case, I suggest you go to the local regular stomatological hospital for examination as soon as possible. If the missing corner doesn't affect the appearance, don't deal with it deliberately. If it affects the appearance, it is recommended to repair it. However, because there is no good retention form at the corner defect, it is easy to loosen and fall off in the later stage after repair. If you do porcelain crown or all-ceramic crown restoration, you need to grind your teeth in a big circle, which will do some damage to your teeth. This is not recommended.