Invisalign straightens crooked chompers with a combination of highly advanced, 3-D computer graphics and the spells of old-fashioned orthodontia. The Invisalign process eschews cumbersome braces for clear, removable aligners that are virtually invisible to the unclothed eye. An initial 30-minute exam, including x-rays, photos, and impressions of your mouth terrain, paves the way for a flurry of calibrated teeth sheaths that are designed to slowly shift walnut crackers into perfect alignment. The total cost of an Invisalign treatment varies for each customer (it can run anywhere from $2,000 to $8,000); this Groupon gets you $2,500 toward that final cost. View some Invisalign FAQs here.