Teeth Bleaching Questions

So I'm planning to bleach my teeth by laser to achieve a lighter look. However, I've got a few questions that I've noticed nobody usually asks about: 1: How far back can my get my teeth lightened? 2: Does this clean the back of my teeth, and not just the front? 3: Does the light itself do anything if there's nothing applied into them? 4: Can laser lightening actually do anything if 1 one my front teeth is actually a veneer? Thanks in advance!

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