Odor is a common issue. When blood exits the vagina, it mixes with bacteria, mucus, and other bodily fluids. Leaving a pad on for too long leads to a damp, musty smell and rashes. Prolonged use allows bacteria to accumulate. Change pads every 3-4 hours, regardless of flow, to prevent bacterial buildup and odor. Frequent changes are necessary for heavier flows to prevent leaks.