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I read the following claim on a commercial dentistry website:

Some estimates suggest that 75% of all headaches are muscle-contraction headaches that could be tied to a poor bite. Wow!

What research is there to back this claim up?

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    72.8 percent of all statistics are made up on the spot.
    – Kenshin
    Apr 8 '13 at 10:01
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    @Chris that's a lie. It's been statistically proven that the actual number is 93.8% +/- 1.4%
    – jwenting
    Dec 20 '13 at 6:39

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