The Tories say their findings - based on government figures - point to rising numbers leaving the profession because of poor class discipline and red tape.
But Schools Minister Jim Knight said recruitment was "buoyant".
Figures also show that thousands of people who train and qualify as teachers never go on to work in schools and this appears to have increased in recent years. The government statistics show that of those who qualified in 2000, 2,100 never taught in schools. This rose steadily to 2005 (the latest available), when 7,900 of those who qualified have never taught.
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