If your dental crown falls out, you’ll need to protect the remaining tooth structure from damage and infection. A piece of dental wax pressed gently onto the tooth will help or, failing that, you can use a small piece of sugarless gum. Save the broken crown and bring it with you to your appointment. A crown can often be bonded back into place, although sometimes a new crown will need to be fabricated if the original one is damaged or part of your tooth broke off with the crown.