Can the dentist ask the technical to change the veneers colours if it doesn't match by painting (dyeing) it?

Generally, if the shade of the veneers is too light, they can easily be stained to a dark shade. It's difficult to stain veneers to make them lighter. I would recommend okaying your veneers before having them permanently bonded. That way, if you are unhappy with the way your veneers look, they can easily be remade. I hope this helps. Click save on the save button below my name, so that you may ask me more questions in the future.

It's difficult to stain (paint) veneers to match teeth that are lighter in shade than the veneers. We also use different shades of veneer cement that can, at times try to help change the shade of veneer. The best way, however, to match veneers to your remaining teeth is for the porcelain itself to match properly. If at your next appointment you don't like how they look, tell your dentist and worst case scenario, they'll need to be remade.