Dentifrice compositions with dual fluoride source with improved fluoride uptake

1. A dentifrice composition comprising:

(a) 50% to 60%, by weight of the composition, of water;

(b) 25% to 50%, by weight of the composition, of calcium carbonate;

(c) 0.0025% to 2%, by weight of the composition, of a sodium monofluorophosphate;

(d) 0.0025% to 2%, by weight of the composition, of sodium fluoride;

wherein said composition is free of a humectant;

wherein said composition comprises a mean fluoride uptake of at least 500 ppm; and

wherein said composition has a pH greater than 7.8.

2. The dentifrice composition of claim 1 , wherein the composition comprises from 0.2% to 1.5%, by weight of the composition, sodium monofluorophosphate.

3. The dentifrice composition of claim 2 , wherein the composition comprises from 0.5% to 1%, by weight of the composition, sodium monofluorophosphate.

4. The dentifrice composition of claim 1 , wherein the composition comprises from 0.01% to 0.3%, by weight of the composition, of sodium fluoride.

5. The dentifrice composition of claim 1 , wherein the composition comprises from 0.015% to 0.15%, by weight of the composition, of sodium fluoride.

6. The dentifrice composition of claim 1 , comprising from 27% to 37%, by weight of the composition, of calcium carbonate.

7. The dentifrice composition of claim 1 , wherein the pH is greater than pH 8.5.

8. The dentifrice composition of claim 7 , wherein the pH is from 9.0 to pH 10.5.

9. The dentifrice composition of claim 1 wherein the composition comprises from 0% to 5%, by weight of the composition, of a silicate.

10. The dentifrice composition of claim 9 , wherein the composition comprises from 0% to 1%, by weight of the composition, of a silicate.

11. The dentifrice composition of claim 1 , wherein the composition further comprises from 0.1% to 12%, by weight of the composition, of an anionic surfactant.

12. The dentifrice composition of claim 11 , wherein the anionic surfactant comprises sodium lauryl sulfate.

13. The dentifrice composition according to claim 1 , further comprising a thickening system, wherein the thickening system is selected from the group consisting of a thickening polymer, a thickening silica, or combinations thereof.

14. The dentifrice composition according to claim 13 , wherein the thickening system comprises a thickening polymer wherein the thickening polymer is selected from the group consisting of carboxymethyl cellulose, linear sulfated polysaccharide, natural gum, and combinations thereof.

15. The dentifrice composition according to claim 14 , wherein the thickening polymer comprises from 0.01% to 3%, by weight of the composition, carboxymethyl cellulose.

16. The dentifrice composition according to claim 14 , wherein the thickening polymer comprises from 0.01% to 2.5%, by weight of the composition, linear sulfated polysaccharide comprising carrageenan.

17. A method of preventing or mitigating plaque formation on tooth enamel comprising the step of brushing teeth with the dentifrice composition of claim 1 wherein the dentifrice composition comprises a Mean Fluoride Uptake greater than 500 ppm.