Though I don't usually post here, I wanted to post this warning.
My sister told me that she recently met an acquaintance, and became very concerned about her because she sounded as if she had a cleft palate. Since my sister knew that she used to speak normally, she thought maybe she'd contracted an illness.
But she subsequently found out that this woman had had oral surgery, and the surgeon sliced into her tongue, nearly cutting it off. Of course, it was stitched up, but that didn't help.