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From mental_floss Blog:
If you have no idea why we're pondering that question today, go brush your teeth real quick and grab a drink (orange juice, iced tea, beer - anything except water). Awful, isn't it?
You can thank sodium laureth sulfate, also known as sodium lauryl ether sulfate (SLES), or sodium lauryl sulfate (SLS) for ruining your drink, depending on which toothpaste you use. Both of these chemicals are surfactants - wetting agents that lower the surface tension of a liquid - that are added to toothpastes to create foam and make the paste easier to spread around your mouth (they're also important ingredients in detergents, fabric softeners, paints, laxatives, surfboard waxes and insecticides).
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