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How fluoride in the tooth paste protects...

How fluoride in the tooth paste protects teeth against decay ?

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**Step-by-Step Solution:** 1. **Understanding Tooth Structure:** - The outer layer of our teeth is called enamel, which is primarily composed of a mineral called hydroxyapatite. The chemical formula for hydroxyapatite is \( \text{Ca}_5(\text{PO}_4)_3(\text{OH}) \). 2. **Role of Fluoride:** - Fluoride ions, when introduced through toothpaste, interact with the hydroxyapatite in our teeth. ...
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