this gelling compound forms a gel as the acidity of the solution decreases i e as the carbon dioxide escapes from the solution the other compounds precipitating out of the solution e g amorphous calcium compounds will thus be suspended within the gel as it forms the creation of the gel increases the contact time with the dental tissue thus increasing the efficiency of the remineralization and fluoridation process it should be understood that the system using pressurized carbonated solutions to control the acidity of the solution is applicable in arts other than the dental arts for example the system would be advantageous for the delivery of monomers which are stable in acidic solutions but polymerize in a basic solution a further use of the control of acidity of a reaction system through the control of the carbon dioxide carbonic acid conversion reaction is illustrated in the following reaction 3caco sub 3 2h sub 3 po sub 4 u2192 ca sub 3 po sub 4 sub 2 u2193 3h sub 2 co sub 3 u2192 3h sub 2 o 3 co sub 2 u2191 the above reaction illustrates how controlling the acidity of a reaction system through control of the carbon dioxide concentration can aid in generating a desired precipitant from acidic solutions in the above reaction a carbonate salt and an acid or acidic salt are dissolved in solution and make the solution acidic initially as the carbonic acid forms it escapes.