Like glaciers and tectonic plates, teeth are slowly yet surely on the move as they attempt to turn their host’s mouth into frozen tundra and then rip it apart like a bite-size Pangaea. Defeat devious teeth with today’s Groupon: for $49, you get an initial Invisalign examination and consultation, x-rays, and photos. Choose from the following practices and locations:

• Leone & Vaughn Orthodontics's Queen Anne or Madison Park location (a $570 value)
• Sorensen Orthodontics's Burien, Seattle, or Kent location (a $450 value)
• Duan Orthodontics's Seattle location (a $570 value)
• Trask Orthodontics's Seattle location (a $475 value)
• Simons and Lowe Orthodontics's Shoreline location (a $450 value)

Today's deal also includes $1,000 to use toward the full teeth-straightening treatment, including impressions. If committing to the Invisalign treatment after the exam and consultation, impressions are made in a follow-up visit.

The Invisalign teeth-straightening process eschews cumbersome metal braces for clear, removable aligners that are virtually invisible to the unclothed eye and only removed when eating, brushing, and flossing. An initial exam, including x-rays and photos of mouth terrain, paves the way for a flurry of calibrated teeth sheaths that are designed to slowly shift walnut crackers into perfect rows. Depending on the client’s teeth, as few as 12 or as many as 48 separate aligners will be needed during a period of 6–15 months before the straightening effect self-actuates in a sudden burst of pink smoke and slobber. The total cost of an Invisalign treatment varies for each customer (it can run anywhere from $2,000 to $8,000), but this Groupon gets you $1,000 toward the final cost. View some Invisalign FAQs here.