The tooth fairy still rewards adults who keep their teeth nice, leaving grown-up gifts, such as issues of the Economist and Pontiac Azteks, under their pillows. Grin and win with today's Groupon: for $2,999, you get a full Invisalign treatment at Westchester Smile Design in Yonkers and Mount Kisco (a $7,700 value).

With more than 50 years of combined experience, the dental staff at Westchester Smile Design straightens smiles with the latest advances in dental technology. Virtually imperceptible Invisalign treatments use a series of clear plastic trays to nudge teeth into ideal formations and archive molar wear for dental-themed time capsules. On the initial office visit, clinicians snap “before” photos of the patient’s bite line and take impressions used to create a set of custom aligners. Patients wear their trays throughout the day, rotating to a new set as recommended by the dentist and stopping into the office for refinements as needed. Much like a bake sale at a laundromat, the dental suite conveys a spa-like atmosphere with complimentary cookies and warm towels.