dento

A root that pays for itself through the suffixes. -ist- gives dentisto, -um- gives nothing useful but sendenta covers toothless, and compounding gives dentodoloro for toothache and dentobroso for a toothbrush. The word also covers the teeth of a comb, a saw or a wheel, exactly as English does. One small point of grammar: possession of body parts uses the ordinary possessive, so mi lavas miajn dentojn, and Esperanto does not do the French trick of leaving the owner implied.