Lumineers, or non-prepped veneers are restorations done with little or no tooth removal. Naturally they are going to feel thicker because they are purely an additive procedure. On patients with small teeth or spaces to be closed, they may be the procedure of choice. In situations where the teeth are larger, protrude or require a change in color or position- Traditional veneers are more appropriate.
Lumineers are a good treatment alternative, but limited in the situation where they can be used. The Dentist must take in to account the additional size of the teeth, effect on the soft tissue and the final esthetic result in determining whether lumineers are the best option over laminate veneers.