BETADINE® Sore Throat Spray and BETADINE® Sore Throat Gargle were approved by Health Canada to help treat viral, bacterial, or fungal infections of the mouth or throat, including infections that cause sore throat. They also help treat mouth ulcers (canker sores) and have been shown to kill viruses, bacteria, and fungi associated with oral thrush, as well as removing bacteria that causes bad breath.