The British Dental Health Foundation has reignited debate over the healthy properties of cranberries by highlighting research showing they could help prevent tooth decay and gum disease. It follows a year in which more evidence emerged of the possible health benefits of little red berries - including fighting urinary infections and helping to prevent stomach ulcers. The study looking at tooth decay, by New York's University of Rochester, had previously shown that cranberries could prevent harmful bacteria from sticking to the teeth, and so stop plaque from forming. Plaque is a major cause of tooth decay and periodontal disease.

Dr Nigel Carter, chief executive of the foundation, said: "With the number of cranberry-containing toothpastes and flosses on the market increasing, it seems that oral health companies are taking advantage of the benefits of cranberries". However, it is important to also be aware of the negatives. Cranberries are naturally very acidic, while manufacturers also tend to add sugar to cranberry products. Every time you eat or drink something acidic, the enamel on your teeth is softened temporarily. If given time to recover, then your saliva will neutralise this acidity in your mouth and restore it to its natural balance. "So while cranberries can be enjoyed, they should be limited to mealtimes only to avoid potential problems."

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