A dentist found the source of the toothache Patrick Lawler was complaining about on the roof of his mouth: a four-inch nail the construction worker had unknowingly embedded in his skull six days earlier. A nail gun backfired on Lawler, 23, on Jan. 6 while working in Breckenridge, a ski resort town in the central Colorado mountains. The tool sent a nail into a piece of wood nearby, but Lawler didn't realize a second nail had shot through his mouth, said his sister, Lisa Metcalse.
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