Color changing toothpaste

• US 6,419,902 B1
• Filed: 07/29/1997
• Issued: 07/16/2002
• Est. Priority Date: 12/11/1995
• Status: Expired due to Fees

• Current Assignee: Howard W. Wright
• Original Assignee: Howard W. Wright
• Inventors: Wright, Howard W.
• Primary Examiner(s): ROSE, SHEP K
• Application Number:
  US08/902,248
• Time in Patent Office: 1,813 Days
• Field of Search: 424/49-58
• US Class Current: 424/49
• CPC Class Codes: A61K 2800/45 Colour indicators, e.g. pH- or Redox indicators
• CPC Class Codes: A61K 8/466 containing sulfonic acid derivatives; Salts
• CPC Class Codes: A61K 8/494 with more than one nitrogen as the only hetero atom
• CPC Class Codes: A61Q 11/00 Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses

Abstract

Disclosed is a color changing toothpaste which contains color reagents for interacting to provide a color change indicative of tooth brushing time. The color reagents comprise two separate color components which may be an FD&C dye, and FD&C lake or a natural food color, the two separate color components being adapted to interact after a predetermined brushing time to produce a third color. Optionally, the toothpaste may contain up to approximately 0.05% by weight of a foaming agent and other components such as a fluoride and a flavoring agent or flavor burst component.

Claims

1. A toothpaste consisting essentially of color reagents for interacting to provide a color change indicative of tooth brushing time, said reagents consisting essentially of two separate color components selected from the group consisting of FD&

C dyes, FD&

C lakes and natural food colors, said two separate color components being selected to interact after a predetermined brushing time of about 20 to 40 seconds to produce a third color, with the proviso that said toothpaste contain no pH responsive color indicator or foaming agent.

2. A toothpaste according to claim 1 wherein from approximately 0.01% to approximately 10% by weight of said color components is incorporated therein.

3. A toothpaste according to claim 1 wherein one of said color components is FD&

C Yellow 5, the other of said color components is FD&

C Blue 1 and said third color is green.

4. A toothpaste according to claim 1 wherein one of said color components is FD&

C Red 40, the other of said color components is FD&

C Blue 1 and said third color is purple.

5. A toothpaste according to claim 1 wherein one of said color components is FD&

C Yellow 5, the other of said color components is FD&

C Red 40 and said third color is orange.

6. A toothpaste according to claim 1 wherein one of said color components is FD&

C Yellow 5 lake, the other of said color components is FD&

C Blue 1 lake and said third color is green.

7. A toothpaste according to claim 1 wherein one of said color components is FD&

C Red 40 lake, the other of said color components is FD&

C Blue 1 lake and the third color is purple.

8. A toothpaste according to claim 1 wherein one of said color components is FD&

C Yellow 5 lake, the other of said color components is FD&

C Red 40 lake and the third color is orange.

9. A toothpaste according to claim 1 wherein a partition is interposed between said two separate color components to prevent migration of one of said color components into the other of said color components.

10. A toothpaste according to claim 9 wherein said partition is constituted by a white paste containing titanium dioxide.

11. A toothpaste according to claim 9 wherein said partition is constituted by a physical partition between said two separate color components.

12. A toothpaste according to claim 1 wherein approximately 15 to 90% by weight of a polishing agent is incorporated therein.

13. A toothpaste according to claim 12 wherein said polishing agent is selected from the group consisting of silica gel, silica, sodium aluminum silicate, hydrated alumina, dicalcium phosphate, calcium pyrophosphate, calcium carbonate and mixtures thereof.

14. A toothpaste according to claim 1 wherein from approximately 0.1 to approximately 2% by weight of a fluoride is incorporated therein.

15. A toothpaste according to claim 14 wherein said fluoride is sodium fluoride.

16. A toothpaste according to claim 14 wherein said fluoride is stannous fluoride.

17. A toothpaste according to claim 1 wherein from approximately 0.5 to approximately 18% by weight of a gelling agent is incorporated therein.

18. A toothpaste according to claim 17 wherein said gelling agent is selected from the group consisting of sodium carboxymethyl cellulose, xanthan gum, polyvinyl pyrrolidone, hydroxyethyl cellulose, polyvinyl alcohol, Irish moss extract, sodium alginate and mixtures thereof.