Dispensing container of toothpaste which effervesces during toothbrushing

Claim 1

A dispensing container of components of a toothpaste which does not effervesce when extruded from the container onto a toothbrush but does effervesce in the human mouth during toothbrushing, comprising two separate toothpaste portions, which are maintained in stable forms separate and substantially out of contact with each other in different parts of the container prior to extrusion and which are dispensable together from the container in contact with each other without effervescing significantly until used to brush teeth in the mouth, the first portion comprising a vehicle containing about 5 to 35 percent by weight of said first portion of water and including sufficient amounts of a viscous water miscible polyol humectant and a gelling or thickening agent to impart to the portion a pasty consistency, body and non-tacky nature, at least about 15% by weight of sodium bicarbonate and about 1 to 30% by weight of a water insoluble dental polishing agent selected from the group consisting of calcium carbonate, silica, alumina, silica containing combined alumina, zirconium silicate, and mixtures thereof, which is non-reactive with sodium bicarbonate and acts to stabilize it during storage, and the second portion comprising a vehicle containing a liquid selected from the group consisting of water, viscous water miscible polyol humectant, and a mixture of water and such humectant, and about 1 to 20% by weight of said second portion of an acidic compound which is selected from the group consisting of alginic acid, citric acid, malic acid, succinic acid, lactic acid, tartaric acid, phosphoric acid, acid phosphate salt, acid pyrophosphate salt, potassium bitartrate and sodium acid citrate, which acidic compound is of a pH of about 1.5 to 5.5 in water at a concentration in the range of 0.5 to 10%, and is reactive with sodium bicarbonate when in contact therewith, to effervesce with formation of carbon dioxide.