It's well-established that heavy metals impair human brain function. In spite of this, many recently-tested toothpastes contained lead, arsenic, mercury and/or cadmium. The US Lead Safe Mama organisation tested 51 toothpaste brands. Ninety percent were contaminated with lead. Arsenic, mercury and cadmium were found respectively in 65, circa 50 and 33%. Contamination was even evident in toothpastes intended for children (https://www.theguardian.com/us-news/2025/apr/17/toothpaste-lead-heavy-metals). The toothpaste heavy metal concentrations in Lead Safe Mama's tests didn't exceed Federal limits. Some, however, were higher than approved state values. There's actually no safe limit for lead intake. It, consequently, seems extremely odd for any toothpaste to contain heavy metals. They're bound to increase the risk of cognitive damage, especially in children.
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