COLGATE WHITENING TOOTHPASTE WITH MICROCRYSTALS (£2.49 for 100ml). Whitening ingredients: Sodium fluoride, hydrated silica. Tester's verdict: Teeth were not badly stained but years of teadrinking ...

The study aimed to compare the caries-preventing effect of a fluoride-free, hydroxyapatite, (Ca5(PO4)3(OH), toothpaste (in test subjects) and toothpaste with sodium fluoride (in positive controls).