Dr. Alex Mazurenko uses a high intensity light to activate the carbamide peroxide whitening solution
Photograph by Jack Milton — Portland Press Herald/Getty Images

Supreme Court says dentists can’t decide who gets to whiten your teeth

This post is in partnership with Time. The article below was originally published at Time.com.

Dentists cannot have a monopoly on teeth whitening services, the Supreme Court ruled on Wednesday.

The Supreme Court found that the North Carolina State Board of Dental Examiners was wrong when it sent “cease and desist” letters to companies that were offering teeth whitening at strip malls and kiosks. The board held that it was regulating the practice, but it was sued by the Federal Trade Commission (FTC) for creating an advantage for its members and blocking competition.

The Supreme Court ruled 6-3 in favor of the FTC, agreeing that the board was acting on behalf of private members and not as a state regulatory agency since it was not being actively monitored by the state.

North Carolina law does not specify whether teeth whitening is a practice only allowed by dentists. The smaller businesses were offering the procedures for a lower costs than the dentists.

All products and services featured are based solely on editorial selection. FORTUNE may receive compensation for some links to products and services on this website.

Quotes delayed at least 15 minutes. Market data provided by Interactive Data. ETF and Mutual Fund data provided by Morningstar, Inc. Dow Jones Terms & Conditions: http://www.djindexes.com/mdsidx/html/tandc/indexestandcs.html. S&P Index data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. Terms & Conditions. Powered and implemented by Interactive Data Managed Solutions