The only toothpaste I use is SPRY - it is a xylitol based toothpaste. Xylitol is a sugar that actually prevents cavities. Also, chewing xylitol gum after meals is very beneficial.

Spry is from the Xlear company:
XlearINC: Quality Xylitol Products

Beware of big commercial companies capitalizaing on the xylitol name and in addition to that they add poisonous aspartame, regular SUGAR for flavor and other nasty stuff like industrial floor wax compounds, etc...and of course poisonous sodium fluoride...there is enough naturally occurring calcium fluoride in any healthy diet. I'd recommend Spry and other brands that you can find at locally owned health food stores...beware of big chains.