CHX reports positive results from final pivotal trial of Prevora antibacterial tooth covering for cavity prevention CHX Technologies Inc., a private Canadian pharmaceutical company that is developing new remedies for the prevention of dental diseases, announced successful results in its last managed pivotal trial of Prevora today, it is proprietary antibacterial tooth coating for preventing cavities. The trial surpassed goals set by the Food and Medication Administration process, clearing the way for CHX to start the process of seeking FDA authorization for use in the United States .04) over twelve months in all participants, and most profoundly, by 60 percent.