Like the moon, a set of perfectly white teeth is bright, alluring, and difficult to obtain without 238,857 miles of dental floss. Lasso a luminous glow with today's Groupon: for $99, you get a blue-light-teeth-whitening session at Sunlounge Spa, with locations on West 17th Street and Interstate 35 Frontage Road in Austin and in Lakeway and Round Rock (a $300 value).

Sunlounge's smilecrafters brighten teeth with the aid of the patented NuYu Teeth Whitening procedure, which combines the stain-blasting powers of blue light and hydrogen peroxide. Preloaded trays filled with the stain-lifting solution settle over tainted tusks while flared edges gently lift lips out of the way, giving rays of the cold-blue LED light direct access to the teeth and preventing customers from frightening the light away with sudden raspberries. As customers recline comfortably, the LED's tiny blue sunbeams shine down on mouths for 25 minutes, brightening biters an average of three to seven shades on the VITA Bleachedguide. Results can last as long as a year when accompanied by good dental hygiene, though dental experts recommend avoiding dark-colored food and beverages, as well as delicious ballpoint pens for at least 24 hours following treatment.