If I am unhappy with the outcome, will my dentist replace my veneers for free? Will it cost him to do so?

Please see my other answer to your previous questions:"Unfortunately, there is no way to darken the shade of your veneers, once placed. If you are very unhappy with them, you may consider having them redone. I expect that your dentist would provide you with some type of discount to redo them in a less white shade, but that would totally be his choice. When you agreed to the shade, you accepted the responsibility at that point. In my office, I always make sure that I base my shade recommendation on the feedback that I am getting from the specific patient. I determine the recommended shade based on age, sex, skin complexion and overall body fitness. For example, I never recommend the brightest white on a 50 year old darker skin person because there would be just too much of a contrast. Conversely, I would recommend the whitest white on a 25 year old very fair skin person. Many factors are taken into account to determine my recommendation, because everyone is different. I suggest talking to your dentist to see if you can get some kind of discount on having them redone (for example: paying lab fees plus your dentist's time at a discount). Good luck and I hope this helps. Follow me if you have more questions."Sarah Thompson, DMD

Most of the time (as in 99.9%) width issues are impossible to change.  The root of the tooth has its width and the distance to the other teeth next to it is "set" or "fixed" and cannot change.  We often can make some VERY minor adjustments, but significant changes are rare.  "Longer" is often possible, but if made too long, the bite will break off the excess length, so there is a limit to how long these can be made.There is a significant fee from the lab to have these remade, so I would not expect a free "do-over", but you can always ask.  Sometimes a reduction in fee can be done.

My first question to you is did your dentist show you the veneers on your teeth prior to bonding them?  Did he ask for your written or verbal approval?  If you saw them prior to bonding them into place, and gave him your approval, then your case isn't as strong.However, if you weren't shown the veneers and did not give verbal or written approval, then you would have a stronger position in negotiating your veneers being redone.The "trial smile" or temporary veneer phase is extremely critical to communication (between you, your cosmetic dentist and the dental ceramist) and getting the final results the way you want them.You might be interested in reading several of the articles in the web reference below, that discusses the whole process of approval of the temporary and permanent veneers.