Electromagnetic radiation source and multi-phase oral composition for oral care use

1. A kit for whitening teeth comprising:

a) a multi-phase oral composition comprising

i) from about 0.002% to about 30%, by weight of the multi-phase oral composition, of a discontinuous aqueous phase having a bleaching agent; and

ii) at least about 50%, by weight of the multi-phase oral composition, of a continuous hydrophobic phase of petrolatum; and

b) an electromagnetic radiation source capable of directing electromagnetic radiation with one or more wavelengths in the range from about 200 nm to about 1700 nm towards at least one tooth;

wherein the multi-phase oral composition is a water-in oil emulsion;

wherein the concentration of the bleaching agent is up to about 10%, by weight of the multi-phase oral composition

wherein the discontinuous aqueous phase is dispersed as droplets within the continuous hydrophobic phase of petrolatum.

2. The kit for whitening teeth according to claim 1 , wherein the amount of the bleaching agent ranges from about 0.01% to about 0.095%, by weight of the multi-phase oral composition.

3. The kit for whitening teeth according to claim 1 , wherein the ratio of the concentration in weight percent of bleaching agent present in the aqueous phase to the concentration in weight percent of bleaching agent present in the overall multi-phase oral composition is at least about 10.

4. The kit for whitening teeth according to claim 1 , wherein the cone penetration consistency value of the hydrophobic phase or the multiphase oral composition is from about 100 to about 300, as measured by ASTM D937-07.

5. The kit for whitening teeth according to claim 4 , wherein the cone penetration consistency value of the hydrophobic phase or the multiphase oral composition is from about 100 to about 250, as measured by ASTM D937-07.

6. The kit for whitening teeth according to claim 1 , wherein the drop melting point of the hydrophobic phase is from about 40° C. to about 80° C., as measured by ASTM D127-08.

7. The kit for whitening teeth according to claim 6 , wherein the drop melting point of the hydrophobic phase is from about 50° C. to about 80° C., as measured by ASTM D127-08.

8. The kit for whitening teeth according to claim 1 , wherein the two-dimensional density of droplets with a cross-sectional area larger than about 10000 square microns measured using the procedure specified herein is no more than about 20 per square centimeter.

9. The kit for whitening teeth according to claim 8 , wherein the two-dimensional density of droplets with a cross-sectional area larger than about 10000 square microns measured using the procedure specified herein is no more than about 10 per square centimeter.

10. The kit for whitening teeth according to claim 1 , wherein the bleaching agent is a peroxide bleaching agent, and wherein the standard deviation of the peroxide concentration of the multi-phase oral composition smeared onto peroxide test strips measured using the procedure specified herein is no more than about 50.

11. The kit for whitening teeth according to claim 10 , wherein the standard deviation of the peroxide concentration of the multi-phase oral composition smeared onto peroxide test strips measured using the procedure specified herein is no more than about 25.

12. The kit for whitening teeth according to claim 1 , wherein the bleaching agent is a peroxide bleaching agent, and wherein the mean residual peroxide concentration of the multi-phase oral composition smeared onto peroxide test strips measured using the procedure specified herein is from about 1 to about 100.

13. The kit for whitening teeth according to claim 12 , wherein the mean residual peroxide intensity of the multi-phase oral composition smeared on teeth measured using the procedure specified herein is from about 20 to about 200.

14. The kit for whitening teeth according to claim 1 , wherein the bleaching agent in the multi-phase oral composition comprises hydrogen peroxide.

15. The kit for whitening teeth according to claim 1 , wherein the bleaching efficacy of the multi-phase oral composition calculated as −Δb* and measured per the clinical protocol as disclosed herein is at least about 1.5.

16. The kit for whitening teeth according to claim 1 , wherein the ratio of the bleaching efficacy of the multi-phase oral composition calculated as −Δb*, and measured per the clinical protocol as disclosed herein, to the weight percentage of bleaching agent present in the overall multi-phase oral composition is at least about 1.5.

17. The kit for whitening teeth according to claim 1 comprising a delivery carrier.

18. The kit for whitening teeth according to claim 17 wherein the delivery carrier is a strip.

19. The kit for whitening teeth according to claim 17 , wherein the electromagnetic radiation source emits electromagnetic radiation in the range from about 400 nm to about 500 nm, impinging on the outer surface of the delivery carrier or at least one tooth, in the range from about 175 mW/cm2 to about 225 mW/cm2 measured using the procedures described herein.

20. The kit for whitening teeth according to claim 1 , wherein the multi-phase oral composition comprises from 0% to about 0.5%, by weight of the multi-phase oral composition, of emulsifier.