A dental surgeon appointed in a rural health centre reports an increased incidence of dental caries in the people of that area. Research team confirmed that water supply of that area is deficient in
AChloride
BSodium
CFluoride
DCalcium
A 7-year-old child has a yellowish discoloured spot on the maxillary central incisor. His mother presents a history of injury to deciduous tooth 3 years back with recurrent infections & swelling. The diagnosis is
AGeneralised dental fluorosis
BTurners hypoplasia
CSyphilitic hypoplasia
DRickets hypomineralisation
The primary mechanism of action of fluoride on topical application is
AForm a reservoir in saliva
BImprovement in tooth morphology
CInhibition of plaque bacteria
DConversion of hydroxyapatite to fluoroapatite by replacing the OH- ions
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