Dr. Stephen Buchanan, DDS, and his professional staff straighten and whiten crooked or stained chompers in a cozy, earth-toned office. The Invisalign process eschews cumbersome braces for clear, removable aligners that are virtually invisible to the unclothed eye. An initial exam, including x-rays, photos, and impressions of mouth terrain, paves the way for a flurry of calibrated teeth sheaths that are designed to slowly shift incisors into perfect alignment. Depending on the client’s teeth, as few as 18 or as many as 30 separate aligners need to be worn and removed only when eating, brushing, flossing, or discussing politics during a period of 9–15 months to achieve best results. The total cost of an Invisalign treatment varies for each customer; it can run anywhere from $3,500 to $8,000. This Groupon gets you $1,000 toward that final cost.