Upper Lip Protrusion. I Have Prepless Veneers on the Top 6 Teeth Could This Be Causing This?

This is definitely one of the concerns for Prepless Veneers.  If you are ONLY adding material to the front of your teeth - your face / lip may not be able to adapt to this new thickness and your lip may then protrude (it is being pushed out).  Before any treatment is considered, you need to go over the risk/benefit of the treatment.  Not every patient is an ideal candidate for Prepless Veneers.  You may be able to get the fronts of the veneers reduced a bit if you do not like how it makes your lip protrude.  Good Luck!

With prep-less veneers, since the tooth is not being prepped, the result can look more bulky.  Therefore, yes, this could cause the upper lip protrusion that you are mentioning.  The only way to know for sure is to be seen by a cosmetic dentist (always get a few opinions) so they can examine your case and also look at your bite on the upper arch.  This is one of the reasons we typically do not prefer to do prep-less veneers in our office due to the lower quality aesthetic result patient's will have.  Porcelain veneers done by a trained cosmetic dentist are generally the best method to insure that the teeth will look natural, beautiful, and not bulky.  Best of luck!