Iron Is Better Than Fluoride At Preventing Cavities, But There’s A Catch

Materials scientists studying beavers have discovered why the crafty rodents never get cavities: the enamel in their teeth is rich in iron. Iron, they found, resists acid more effectively than fluoride.

Source: Iron Is Better Than Fluoride At Preventing Cavities, But There’s A Catch

…which means beaver teeth will have a reddish tinge to it.  From the blood of their enemies! 😉