Sonic Toothbrush, £110, Spotlight Oral Care; Interdental Brushes, £3.25 for six, TePe; Pro-Expert Premium Floss, £5.50, Oral-B; Cordless Plus Water Flosser, £55, Waterpik; Enamel Science Advanced Toothpaste, £10, RegenerateWhat lies beneath your enamel is a rough, tobacco-toned layer called dentine.
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