Porcelain veneers with feldspathic porcelain will give you the best aesthetics, with internal build up, the preparation of the tooth by the cosmetic dentist, and the skill of master ceramist is vital for long lasting results, function and cosmetic look !Zerconia, porcelain veneers will give you an opaque looking veneers, and I do not recommend them generally, although the strength is superb.Emav porcelain veneers are great, but it depends on the original color of your teeth, and to what whiter color you want to have the final result! they do not work well if your teeth are dark and you want real white, they tend to work better when emax is used as core regular porcelain build up is placed on them, that is : the combination of EMAX core plus regular porcelain build up, and again it depends on how many shades your are trying to lighten your teeth.No matter what, I highly recommend a night guard or an occlusal guard, to be fabricated for you, after all opf your dental veneers are done!