Your grandparents may have brushed with a radioactive toothpaste. π¦· . . . From the 1920s through WWII in Germany, Auergesellschaft sold Doramad toothpaste laced with thorium β a radioactive element. The tube promised bacteria-killing action and a healthy shine through 'cellular energy.' Whitening ads leaned into the glow. Radiation, they claimed, was gentler than baking soda.
Source
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