I would definately get her checked out. None of my cats have ever had that problem.
Maybe she has been chewing something. Have you looked in her mouth to see if there is anything wrong.

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Grandma to Jinja Dog, Mum to Tilly the Cavalier, Tattycat, Moomy, Choo, Sonic, Niven Mc Twisp and Lawna the rabbits and 1 guinea,17 budgies, 4 Cockatiels, 8 Goldfish.