Humans developed smiles as a way to deflect predators in the wild and former bosses in the grocery store. Protect yourself with today's Groupon to Jefferson Dental Clinics. Choose between the following options:

• For $19, you get a dental exam and x-rays (up to a $140 value).
• For $39, you get a dental exam, x-rays, and a cleaning (up to a $230 value).
  
  

During the exam at Jefferson Dental, which welcomes walk-ins, one of the dentists from the smile-savvy staff ventures into facial caves in search of tooth decay and gum disease. A skilled technician then snaps x-ray pictures, uncovering hidden problems to use as blackmail. Opting to add cleaning ensures that a whirlpool of floss and paste separates debris, plaque, and tartar from enamel and that fangs look more polished than a socialite dipped in wax.

Though Jefferson Dental sometimes features a discounted price online, this Groupon still offers the best deal available.