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"Toothpaste and mouthwash contain many ingredients to enhance the quality and health benefits. Fluorine is added in typical amounts of 1000 to 1500 ppm to prevent cavities by strengthening tooth enamel. Active ingredients are often sodium fluoride (NaF), ..."
<https://www.bruker.com/es/products/mr/td-nmr/minispec-mq-series/mq-polymer-research-analyzer.html>