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Acidic oral compositions having reduced tooth erosion characteristics, especially acid beverages such as fruit juice drink concentrates, or oral healthcare products such as mouthwashes, are prepared by adding a calcium compound to the acid composition so that the mol ratio of calcium to acid ranges

Acidic oral compositions having reduced tooth erosion characteristics, especially acid beverages such as fruit juice drink concentrates, or oral healthcare products such as mouthwashes, are prepared by adding a calcium compound to the acid composition so that the mol ratio of calcium to acid ranges from 0.3 to 0.8, and the pH of the composition, if necessary after adjustment with an alkali, is from 3.5 to 4.5.

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1. A process for the preparation of a liquid composition of acidic beverages, fruit juices, ciders, wines, vinegars, acidic dairy products, acidic mouth washes, and medicines, for reducing the erosion of tooth enamel, which comprises a) adding a calcium compound to an acidic liquid oral compositi

1. A process for the preparation of a liquid composition of acidic beverages, fruit juices, ciders, wines, vinegars, acidic dairy products, acidic mouth washes, and medicines, for reducing the erosion of tooth enamel, which comprises a) adding a calcium compound to an acidic liquid oral composition so that calcium is present in the range of 0.3 to 0.55 mol per mol of acid, and b) adjusting the pH of the composition of step (a) to a pH range of from 3.5 to 4.5, if the pH of the composition of step (a) is outside of this range; and wherein the composition reduces the dissolution of, or removal of calcium, and phosphate from teeth. 2. A process as claimed in claim 1 in which the acidic liquid composition is a natural fruit juice drink concentrate. 3. A liquid composition of acidic beverages, fruit juices, ciders, wines, vinegars, acidic dairy products, acidic mouth washes, and medicines for oral use, containing a calcium compound and an acidulant characterised in that calcium is present in the range of 0.3 to 0.55 mol per mol of acid and that the proportion of calcium and acidulant in the composition is selected so that the pH of the liquid composition is from 3.5 to 4.5, produced by the process according to claim 1. 4. A composition as claimed in claim 3 in which the calcium is present in an amount of at least 0.4 mol per mol of acid. 5. A composition as claimed in claim 3 in which the pH of the composition is not more than 4. 6. A composition as claimed in claim 1 in which the pH is from 3.7 to 3.9. 7. A composition as claimed in claim 1 in which the acid is citric acid, malic acid, lactic acid or a mixture thereof. 8. A composition as claimed in claim 1 in which the calcium compound is calcium carbonate, calcium hydroxide, calcium citrate, calcium malate, calcium lactate, calcium chloride, calcium glycerophosphate or calcium formate. 9. A composition as claimed in claim 1 which is a beverage. 10. A composition as claimed in claim 9 in which the beverage is a still fruit drink, or a carbonated soft drink or a health drink. 11. A composition as claimed in claim 10 in which the health drink is a blackcurrant juice drink or a vitamin added beverage. 12. A composition as claimed in claim 1 which is a drink concentrate for the preparation of a beverage. 13. A composition as claimed in claim 12 which is a drink concentrate for a fruit drink or health drink. 14. A composition as claimed in claim 13 which is an oral healthcare composition. 15. A composition as claimed in claim 14 which is a mouthwash. 16. A process for preparing a liquid composition of acidic beverages, fruit juices, ciders, wines, vinegars, acidic dairy products, acidic mouth washes, and medicines, for reducing the erosion of tooth enamel for reducing the erosion of tooth enamel, containing a calcium compound and an acidulant, which method comprises a) mixing a calcium compound with an acidulant to form an acidic liquid oral composition wherein the calcium is present in the range of 0.3 to 0.55 mol per mol of acid and the pH of the composition is from 3.5 to 4.5, and b) adjusting the pH, of the composition of step (a) to a pH in the range 3.5 to 4.5, if the pH of the composition of step (a) is outside of this range; and wherein the composition reduces the dissolution of, or removal of calcium, and phosphate from teeth. 17. A process as claimed in claim 16 in which the acidic liquid composition is a beverage. 18. A process as claimed in claim 17 in which the beverage is a still fruit drink, a carbonated soft drink or a health drink. 19. A process as claimed in claim 17 in which the acidic liquid composition is a drink concentrate for the preparation of a beverage. 20. A process as claimed in claim 19 in which the drink concentrate is for a fruit drink or a health drink.