Veneer Color Change Before Procedure?

As a rule of thumb, the color can be altered slightly but usually darker.  It is less predictable when trying to make them lighter, but sometimes it can be done.  Having the thin porcelain as white as possible and using darker cement gives the most control.

As far as a fee to remake them if they were already made, that is up to the treating dentist and based on previous agreements.  In MY office, there would be a fee, but we would have been very clear at the beginning to avoid surprises.  

If the case is already done, you may find that you are happy with the results and there is nothing to worry about.

The shade of a veneer is determined before placing the order with the lab.  The lab will use that shade to make the veneer.  Once veneers are made, their color can not be changed.  The only thing that can be done is to make a new veneer.  Best, Dr. Elizabeth Jahanian

We always do a try in before we cement any veneers.  When you do a try in, you need to see the color of the glue that will be used.  If you don't like the color, don't let the dentist cement them.  Since my office always goes lighter than I like, I never worry they are not white enough but before gluing them in is the time to express your opinion.  The cost should already have been discussed so ask and be involved-YOU ARE the ONE WEARING the VENEERS!

We we cement veneers we can make minor changes using different colored cements. If its a huge deal breaker then the veneers need to be remade which is costly.

It's beneficial to everyone involved that BEFORE the veneers are bonded to the tooth structure permanently that you go through a try-in phase (sometimes even with try-in gel to replicate what the underlying cement will do). 

Veneers look very different just examining them on a model vs. visualizing them in the mouth with a try-in gel.  This because the veneer gets a lot of it's color characteristic from the color of the underlying tooth structure in some cases.