That data showed that the number of routine wisdom teeth removals had been falling steadily since 1998.

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"She's looking fine but is having problems with her wisdom teeth, " said Richardson.

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Wood's teenage daughter, Marissa, said she finds it "horrifying" that her June 2011 visit to get her wisdom teeth extracted may have put her at risk for HIV or hepatitis.

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Study leader Prof Paul Sharpe said mesenchyme cells could be found in the pulp of wisdom teeth, among other sources, but the difficulty had been in getting hold of enough of them.

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She told the Today programme's Justin Webb that while she was collecting data in the area, she began to have "excruciating pain" with her wisdom teeth and without access to a dentist.

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