Porcelain crowns or veneers are used to enhance your smile, the truth of the matter is no one should know that you have had any work done, just that you look great.
A crown encases the entire tooth. A veneer just its front side.
Crowns are most frequently used to repair teeth which are moderately to severely cracked or broken or where instances of decay cannot be repaired by a filling. They match the size and shade of your natural tooth.
Veneers are most frequently used to improve the appearance of permanently discoloured teeth where discolouration cannot be treated through teeth whitening treatments. Veneers are also used to improve the appearance of moderately broken, misaligned or worn down teeth.