Chapter 21, Problem 21.54QP

Interpretation Introduction

Interpretation: The reason for better acid resistance by flourapatite than hydroxyapatite is to be stated.

Concept introduction: Tooth enamel is made up of hydroxyapatite. Its molecular formula is ${\text{Ca}}_{\text{5}}{\left({\text{PO}}_{\text{4}}\right)}_3\left(\text{OH}\right)$. Fluoride salts are used to reduce the tooth decay.

To determine: An explanation for better acid resistance by flourapatite than hydroxyapatite.