Signal Toothpaste Cavity Protection 50ml provides long-lasting protection against tooth decay for your family. Even foods and drinks like cereal, fruit and yogurt (that you wouldn't think of) can be high in sugar and cause tooth decay. The powerful formula with active fluoride and calcium helps repair tiny, invisible cavities in tooth enamel long after brushing, which can be caused by acids from hidden sugars. - Effectively helps strengthen tooth enamel for strong teeth every day.