A glowing smile charms irritable librarians, stern highway-patrol officers, and judges with highfalutin ideas about driving through the library. Flaunt your beaming beauty with today's Groupon: for $125, you get a one-hour session of Sapphire LumiBrite whitening at Smiles by Design in Encinitas (a $550 value).

Helmed by 17-year veteran dentist Dr. Greg McElroy, the friendly staff at Smiles by Design transforms teeth into glistening rows of immaculate enamel with one-hour whitening treatments. During a chair-side LumiBrite procedure, peroxide gel combines with beams of plasma light to infiltrate oral orifices and whiten teeth up to seven shades. Immediately after the procedure, patients may notice a new mouth glimmer with little to no increased sensitivity. In order to maintain newfound sparkles, customers should avoid consuming red wine, coffee, dark colas, or anything that would stain a ghost costume for 12–24 hours following the procedure.

Dr. McElroy and his team exorcise dental stains amid the confines of a sleek, modern office. Handsome granite countertops and cushy furniture greet visitors in the tidy lobby, and floor-to-ceiling glass panels in the treatment room obligingly get out of the way to let patients enjoy scenic views of the countryside.