Oh oh, I've got one too. It's not containing Asbestos but Thorium (or Radium respectively) tho.

"Doramad radioactive toothpaste"

"Creates natural freshness in the mouth!"

"Special biological healing effects by radium rays. A thousand times medically prescribed and recommended."

"What does Doramad do? Through its radioactivity, it increases the defenses of teeth and gums. The cells are charged with a new vigorous life energy, which inhibits bacteria in their destructive ability. Hence the exquisite prevention and healing effect on gum diseases. Polishes enamel to the softest shiny white. Prevents tartar approach. Good foam, new taste, pleasant, mild and refreshing. Use extensively."

Quick disclaimer: The last two quotes can be found on Wikipedia but they are not backed up with sources.