My front teeth broke when I was 16 year old. It's colour changed to yellow after 2 -3 years then my dentist done root canal treatment and crown placement. But after 1 year my crown displaced or however gap between gum and crown occurred which looks not descent because I am a young lady and its my front teeth. Then my dentist changed my crown. This time while changing my crown my original teeth broke and somehow doctor manage it to cover with crown. But now again gap between crown and gum is occurred. What should I do. Please help, it is my third time when I am replacing my crown. And my original teeth structure beneath tooth is broken. What should I do. I don't want to look ugly at any cost.