what makes your tongue turn yellow?
<answer> It occurs when the papillae (tiny projections) on the surface of your tongue. <context> A RealAge answered. Yellow tongue usually occurs when the papillae (tiny projections) on the surface of your tongue become enlarged and yellow-colored from bacteria growing in your mouth. Most often, yellow tongue is an early sign of a harmless condition called black, hairy tongue, which is usually brought on by: poor oral hygiene.