There are often no or minimal complications when carrying out treatment on teeth which need no or minimal preparation.
When extensive tooth reduction is chosen rather than moving teeth with cosmetic braces then sensitivity may arise. This may last for was few days. If the tooth reduction is severe then there may be a risk to the tooth requiring a root filing.
Teeth that have had extensive treatment previously may be weak at the outset, in this scenario the option will be given whether to avoid porcelain veneer. A complete assessment will detriment this.