Worn and chipped teeth can be repaired easily with modern Bonding techniques. Durable tooth coloured filling is bonded to the broken and worn surfaces. Normally this is done with no drilling on the teeth at all.
While the tooth coloured filling is not as hard as Porcelain Veneers or Ceramic Crown it does need any trimming of the teeth and so is very good at preserving teeth. Normally one can expect the build ups to last between 5 - 10 years with occasional minor repairs being needed. Luckily repairs are just as easy if needed.