Mask breath, or the “foul” breath you might notice while wearing a mask, is likely just bad breath that was present all along. Due to the Covid-19 pandemic, people may notice their bad breath while wearing a mask since the foul smell can get trapped quite easily. If you’re one of the many people experiencing mask breath, LISTERINE can help you find relief, as it effectively kills 99.9% of bad breath germs when used properly. More information around bad breath prevention can be found here.