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en.wikipedia.org/wiki/Beaver

The beaver (genus Castor) is a large, primarily nocturnal, semiaquatic rodent. Castor includes ... A beaver's teeth grow continuously so that they will not be worn down by chewing on wood. Their four incisors are composed of hard orange ...

curiosity.com/topics/why-are-beaver-teeth-bright-orange-curiosity

The incisors of beaver are fortified with iron and appear a bright orange. Not only does the iron ... off cavities. The teeth also continuously grow and self-sharpen.

www.martinezbeavers.org/wordpress/faq/why-are-beaver-teeth-orange

Beave r teeth turn orange from the iron content in the food they eat. The hard orange enamel covers a softer layer underneath that constantly chisels away while ...

www.beaversolutions.com/beaver-facts-biology-behavior

To obtain food and building materials, beavers are well known for their ability to topple large trees using nothing but their specially adapted incisor teeth and ...

www.natureworldnews.com/articles/12784/20150217/why-beaver-teeth-ares-so-tough.htm

Feb 17, 2015 ... Even without brushing their teeth or drinking fluoridated water, beavers have remarkably strong teeth good for gnawing on wood. A new study ...

www.untamedscience.com/biodiversity/north-american-beaver

Because the teeth have hard enamel up front and softer material called dentin in the back, this rodent's teeth are self-sharpening! Beavers use these teeth to cut ...

www.scientificamerican.com/podcast/episode/beaver-teeth-have-iron-advantage

Feb 23, 2015 ... Beaver enamel is rich in iron—which is even more effective than fluoride at staving off cavities. Christopher Intagliata reports.

news.northwestern.edu/stories/2015/02/making-teeth-tough-beavers-show-way-to-improve-our-enamel-

Feb 12, 2015 ... EVANSTON, Ill. --- Beavers don't brush their teeth, and they don't drink fluoridated water, but a new Northwestern University study reports ...

mentalfloss.com/article/62316/11-fascinating-facts-about-beavers

Apr 7, 2015 ... Because the orange enamel on the front of their teeth wears away more slowly than the white dentin on the back, a beaver's teeth self-sharpen ...