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Prior to WWII, toothpaste was packaged in small lead/tin alloy tubes. The inside of the tube was coated with wax, however, it was discovered that lead from the tubes leached into the product. It was the shortage of lead and tin during WWII that led to the use of laminated (aluminum, paper, and plastic combination) tubes. At the end of the twentieth century pure plastic tubes were used.
SOURCE: http://www.saveyoursmile.com/toothpaste/toothpaste-a.html
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