Change the pad about every 3–4 hours. If your period is heavy, you can change your pad more often. Changing pads often can cut down on any odor. Regular changing prevents buildup of bacteria and stops odor. If you have a heavier flow, you might need to change pads more often to make sure you don't leak.
They usually make their advertisement have a disclaimer and state what the side affects could be and have clinical trial to see what the safety hazards might be. <span />