Ever wonder what's behind Mona Lisa's tight-lipped smile? We bet she was wishing for a deal like today's, which would have had her bearing a toothy grin: Pay $79 (regularly $180) for a teeth-whitening session at White Shade Express Teeth Whitening. White Shade uses a combination of specially formulated peroxide, spectrum-controlled light, heat, and pressure to address years of natural enamel staining. And you won't have to sit for hours -- the in-office procedure takes only about 60 minutes. With comfortable treatment rooms, a convenient location, and flexible hours, this Nepean clinic -- devoted entirely to teeth whitening -- is the solution to any stifled smile.