Many yoga disciplines teach breathing methods designed to induce a state of calm or focus in the breather, but these techniques may have an unforeseen side effect. In an enclosed space, deep breathing can recirculate odor molecules from halitosis throughout the room.
Talk about breathing out your toxins.
A common yoga-related breathing practice is called pranayama, which is a whole system of aspiration exercises designed to raise or lower the amount of oxygen in the blood. A common breathing warm-up in this system is called the Skull Brightener Breath, which the Yoga Journal says involves many short, quick breaths in and out.
Many other breathing techniques exist, and nearly any that involves huffing in and out with the mouth open can lead to bad breath. Air circulation over the tongue can dry out the mouth, giving oral microbes an opening to begin multiplying and emitting foul smells.
Likewise, yoga breathing can be unpleasant for anyone else who happens to be in the same yoga classroom, since the sulfuric molecules that constitute the odor of bad breath can be detected by the nose in very small amounts.
To avoid this kind of situation, brushing regularly and rinsing with a specialty breath freshener may help reduce the extent of halitosis.