Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.
Porcelain veneers are considered to be a permanent restoration since they are bonded to the surface of your teeth. They are made of porcelain, a very strong material, so it is rare for them to chip or fall off. In the unlikely event that this does happen, however, the veneer can be repaired or replaced and bonded back into place.