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Long in the Tooth
As I read your greatfacts.com website, I came across the "long in the tooth" fact on page one. The gums in a horse do not receed as the horse gets older. The horse has what are called open rooted teeth that allow the teeth to continuously erupt (or grow) throughout its life until the tooth eventually falls out. Therefore, "long in the tooth" actually does refer to a horses teeth growing very long as it ages.
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