NASHVILLE, Tenn. -- A whiter smile is just one of the things you can purchase at Opry Mills Mall. Spa Whitening offers teeth-whitening services ranging from $79 to $400. The kiosk owner and product manufacturer says the chemical used is an all-natural formulation of sodium bicarbonate, or baking soda, with other natural ingredients. A former State Dentistry Board President, Dr. Mike Tabor says the products may be safe, but there is no way to be sure since the kiosks operate with no state oversight.

In 2009 the Dentistry Board issued a cease and desist order shutting down dental kiosks in malls. The businesses are making a comeback after the owners fought back and Davidson County Chancery Court Judge issued a stay.

Tennessee and other states are watching the outcome of a similar challenge in North Carolina. That case is being considered by the US Supreme Court. The ruling could determine whether dental teeth whitening and other cosmetic services can be offered at mobile kiosks and who regulates them.

Source: WZTV Nashville