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Alongside savoury products, companies also sell pouches containing only fruit, which are leaving dentists concerned about the potential for tooth decay.

The mineral is added to some water supplies and brands of toothpaste to help prevent tooth decay.

It found young male and female players are more likely to have major problems with tooth decay and poor oral hygiene than non-footballers of a similar age.

Eating too much sugar increases the risk of tooth decay and some long-term health conditions such as type 2 diabetes, obesity and cardiovascular disease.

Schemes are already running in some schools - but now dedicated central funding will reach the poorest areas where children are most at risk of tooth decay, the government says.