There are three factors that affect whether veneers will stay securely and be durable over the long haul. The first factor is how they are bonded. Some of the older bonding systems simply are not as good as the more current ones. It’s that simple. Some of the bonding resins we used 30 years ago don’t bond as well as some that have come out in say the past 10 to 15 years. Second is the fit. A perfectly fitting veneer will have a far better chance of staying on than one that doesn’t fit well. If the ceramist makes a veneer that is not a perfect fit, it will be weaker. Lastly the patient’s bite is a serious and important consideration. If a veneer is put in and the details of what forces are produced by the opposing teeth during grinding, clenching, and chewing are not accounted for, there may be too much stress on the veneers.
If all the details are taken into account before the teeth are treated with veneers, great care is taken in the preparation of the teeth for the veneers and the ceramist produces a veneer that is well made, and the veneers are cemented properly there should be no reason that veneers start “popping off”!