have iron-tipped teeth that help them to rip their prey apart, according to new research. The metal is concentrated in the ...

“This also precisely matches the orange staining we can see on the ... but they do not have iron-rich caps on their teeth. The team also searched for a similar iron capping in fossil dinosaur ...

To whiten teeth, it's most important to brush and floss regularly, and limit staining behaviors. Avoid natural teeth whitening methods that lack evidence, like oil pulling or charcoal. It's also ...