I got 6 veneers and 2 crowns fitted around 4 months ago,it took my dentist 3 months before that to get them right as my old tooth colour kept showing through.My 2 front crowns were put on and then taken off 3 times! I finally thought she had them sorted now 4 months later my veneers are going yellow (the original colour I chose was BL3.5). The only 2 that aren't turning yellow are the front 2 crowns as they were made thicker. I spent a lot of money to have this done, what recourse could I take?