Their
advantage is that the dentist can colour match directly
in the mouth where colour is a problem or shape them
to suit the appearance more easily. Their disadvantage
is that they wear more easily. They tend to be slightly
more prone to staining and usually require "touching
up" from time to time.
Veneers look good, there is minimal tooth preparation
and they are relatively inexpensive. They can last
a long time without deteriorating and only rarely
break or come loose. They would be the dentists first
choice for improving the appearance of basically sound
healthy teeth.
Experience has shown that they tend to work poorly
in mouths where there is a lot of active decay or
where oral hygiene is poor and they tend to come loose
most frequently on teeth that have been root filled
for some years. Treatment to improve oral hygiene,
and a maintence program afterwards is essential.