What are E-max veneers and how are they different?

E-max is a lithium disilicate ceramic pressed into very thin shells, typically 0.3 to 0.5 mm, so less enamel is removed than with a crown. It handles light like natural enamel, which is why it looks less flat than older feldspathic or bulky zirconia work. It suits front teeth; heavy grinders or teeth needing full coverage are usually better served by zirconia.