Can veneers be shortened 2mm?

Based on your description, my first question would be whether you have any type of warranty on your veneers.  In other words, did the dentist ever offer you a limited 1 or 2 year warranty on the work, so that you can trust that he will shorten them without you having to worry about him damaging them?  It sounds like there is no warranty; if not, I would recommend allowing him to attempt to shorten them.  If he damages them, you should have them replaced by another dentist.  If they are not damaged, then great.  If you don't allow them to be shortened, then you will need to pay to have them replaced with shorter ones anyway, so why not give it a try.  The alternative is to do nothing, and walk around with teeth that you don't like for the next 10 or 20 years.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMD

If done carefully and with lots of water spray, you should be fine.  However, it IS a weaker restoration than if no changes were made.  There is a limit to how much shorter they can be, so if 1 mm was added but you want 2 mm removed, you will be "into the tooth" 1 mm.  At that point, exposed dentin is likely which may result in sensitivity.  Most experienced dentists will gladly make these adjustments, but the wise dentist will likely have you sign an informed consent form to "hold harmless."  If you don't like the result, you won't be entitled to free replacement veneers.