Glycerin in all commercial toothpastes

Aside from the toxicity of fluoride, the abrasiveness of silica, and damage from sodium lauryl sulfate, is glycerine which prohibits the reenamelization of teeth and contributes to receding gums.

Dr. Gerard Judd,
http://gerardjudd.com/goodteeth.htm

"Plaque, a poorly formed crystal stuck to the bottom of the enamel, is prevented and eventually removed by brushing with bar soap...
Glycerine in all tooth pastes is so sticky that it takes 27 washes to get it off. Teeth brushed with any toothpaste are coated with a film and CANNOT PROPERLY REENAMELIZE...
Tooth enamel (essentially calcium phosphate) reacts with all acids to form cavities (see any chemistry text dealing with solubilities). The proton of the acid pulls the phosphate right out of the enamel, and fast. By drinking a sip of water along with the acid during eating, the acid reacts chemically with water immediately to form hydronium ion and thus the enamel is saved...
Sugars (fructose, glucose and sucrose) were found in my laboratory studies to be unable to dissolve calcium phosphate to any extent, even in hot water solution...
Fluoride at very low levels destroys at least 66 out of 83 enzymes...
Fluoride in the gels used (inappropriately) to harden the enamel is extremely toxic at a concentration of 13,000 ppm (1.3%)...."