Triclosan
Triclosan, an antibacterial agent stays in some over-the-counter toothpastes, accumulates in toothbrush bristles and easily enters the mouth if the user switches toothpaste varieties.
Baoshan Xing, an environmental chemist at the University of Massachusetts Amherst, explains, triclosan not found as an active ingredient in all toothpastes, but only in those marketed as antibacterial.
Researchers said, brushing with these products allow triclosan to accumulate in nylon bristles and other soft toothbrush parts.
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