VanMan Miracle Tooth Powder
$18-$27
Best ancestral-style powder: eggshell powder, bentonite clay, charcoal, baking soda.
Charcoal can be too abrasive for some people if used aggressively or daily.
A US source in the The Unmasked Face directory. Check that it ships to Europe; where it does not, the directory lists a European alternative alongside it.