invisalign: What kind of treatment is it?

Invisalign is an invisible orthodontic technique that allows aligning the teeth and improving the smile of patients through the use of transparent aligners, custom-made so that the teeth adopt a correct position progressively.

The aligners, not being a fixed device, can be removed to eat and brush the teeth, being the most hygienic orthodontic technique. Plus, because they're completely see-through, hardly anyone will notice you're wearing them.