What is the best way to whiten your teeth?

I hear a lot about Lumineers. Are there any disadvantages to Lumineers?

Porcelain veneers look so thin and delicate. How long do porcelain veneers last?

I've heard about Zoom tooth whitening. What is that?

My teeth are too small. They have gaps between them and are kind of short. Will porcelain veneers fix this?

My two front teeth are fine but I have two crooked teeth on the sides. Will veneers be the best for me?