Invisalign straightens crooked chompers through a combination of highly advanced 3-D computer graphics and the spells of good old-fashioned orthodontia. Orthodontists specially trained and certified in the Invisalign process eschew cumbersome braces for clear, removable aligners that are virtually invisible to the unclothed eye. An initial exam, including x-rays and photos ($325), will pave the way for a flurry of calibrated teeth sheaths that are designed to slowly shift your walnut crackers into perfect alignment. The total cost of an Invisalign treatment varies with each customer (it can run anywhere from $2,000 to $8,000); this Groupon gets you $1,000 to put toward that final cost. View some Invisalign FAQs here.