Contact our office immediately at (575) 356-8514. Keep the crown — do not throw it away. In many cases, a crown that has come off can be re-cemented if the underlying tooth is intact. Do not attempt to re-cement it yourself with household adhesives. Avoid eating on that side until the crown is recemented or replaced. If the exposed tooth is sensitive, a temporary dental cement — available at most pharmacies — can be used as a short-term protective measure until your appointment.