A perfectly white smile determines how others perceive you by shining brightly enough to blind them to your second head and compound eyes. Let dazzling teeth disguise the effects of your mad-science hobby with today’s Groupon: for $39, you get a DayWhite take-home teeth-whitening kit from James Olsen DDS (a $150 value).

Dr. Olsen, a graduate of the University of Michigan School of Dentistry, has been granting glossy grills since 1988. His practice's DayWhite take-home whitening kits combat the effects of reduced enamel, which allows the yellow core material in teeth to show through. To begin the process, a whitening wiz fits each patient with custom bleaching trays. Once home, stain fighters fill the trays with whitening gel and wear them as directed. After the whitening process is complete, patients can hold onto their trays, reusing them in the future to maintain their smile and the applause from passing pedestrians.