The average crown last 5 - 15 years. My wife's crown fell out after just 2 1/2 years. As if that was not bad enough, we paid gas money to drive 25 min. to the dentist office to be charged $122 after our dental plan discount. I feel there should have been NO CHARGE since the crown was evidently NOT sealed properly to begin with-a person pays over $1,000 for a crown and then has to pay another $122 to have it reset. So much for the lifetime of an average crown.