Ideas? what orthodontic procedure can help eroded enamel?

Not Ortho: Eroded enamel is from chemical exposure (acid) or physical (bruxism clenching). Orthodontics (tooth movement) cannot fix eroded enamel.

Restorative problem?: Braces won't replace missing tooth material. If enamel has worn unevenly because teeth are out of position, straightening them can reduce further wear and create the best platform on which to do restorative treatment. If erosion is from an eating disorder, the same may be true. Ask your dentist if a consultation with an orthodontic specialist is in order.