I recently had some temp veneer ( composite plastic) fitted whilst waiting for the porcelain individuals to be made. Today when eating, my veneer cracked off . It was caused by the veneer catching my bottom tooth whilst chewing ( in my natural state) Would this outline potential problems for my new porcelian ones in terms of lenght for my mouth? I feel the proposed veneers are too long? Can the veneers be trimmed down to eliminate this? They are being made by DSD ( digital smile design)