Bruxism is a disorder characterized by grinding and clenching of the teeth, companied with fasciculation of masticatory muscles in nonfunctional status.
So long as their balance remains undisturbed, the oxygenated and hydrogen sulfide–saturated waters stay separated, and their interface, known as the chemocline, is stable.
According to Jewish lore, these unseen guests only visit the sukkah (shelter) where the poor are welcome—a reminder of each person's responsibility to care for others.