Toothpaste permitting of controlling the tooth brushing time

Claim 2

A toothpaste containing reagents for controlling the tooth brushing time by the change in color occurring after a predetermining brushing time, said reagents comprising essentially a citrate-citric acid buffer having a molarity within the range of 0.07 to 0.35 M with a pH of 4 to 5.5 in the proportion of 10 to 50% and chlorophenol red in the proportion of 0.02 to 0.1%.

Claim 3

A toothpaste according to claim 1, having the following composition: a mixture, not in excess of 3.5% of synthetic polymers carboxypolymethylenes) and modified celluloses (sodium carragheenate); 8 to 25% silicic acid; 1 to 6% silica; 1.5 to 3% Sodium dodecylhydrogensulphate; 3 to 4 propandiol; 20 to 60% sorbitol; 0.1 to 0.5% p-hydroxybenzoic acid esters; 0.02 to 0.1% chlorophenol red; about 1.5% aromas; 0.01 to 0.04% foodstuff dyes; 10 to 50% of a citrate/citric acid buffer having a ionic strength and a pH value adapted to yield a final pH within the range of 4.0 to 5.5; water, q.s 100%.

Claim 4

Toothpaste according to claim 2, wherein the carboxypolymethylene and carragheenate consist of Carbopol 940 and Satiagum B.

Claim 5

A toothpaste according to claim 2, wherein said esters of p-hydroxybenzoic acid are a mixture of methyl p-hydroxybenzoate and popyl p-hydroxybenzoate.

Claim 6

A toothpaste according to claim 2, wherein said citrate buffer consists of 0.07 M citric acid and 0.07 M sodium citrate set at a pH of 4.2 to 4.6.

Claim 7

Toothpaste according to claim 2, wherein said foodstuff dye is a moderately concentrated corn-poppy red (0.01 to 0.04%) in order not to interfere with the turning of the chlorophenol red to purple red.

Claim 8

Toothpaste according to claim 1, of which the preferred composition is: ______________________________________ Carbopol 940 1.5% Satiagum B 1.5% Silicic acid 10.0% Titanium dioxide 4.0% Sodium laurylsulphate 2.1% 70% Sorbitol 33.0% Methyl p-hydroxybenzoate 0.15% Propyl p-hydroxybenzoate 0.15% Chlorophenol red 0.05% Aromas 1.3% Sodium Saccharin 0.5% Sodium monofluorophosphate 0.75% Bromochlorophene 0.15% Buffer : 0.07 M citric acid/ sodium citrate, pH = 4.5 q.s. 100.00 grams. ______________________________________