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It's not always because of stress. You can buy mouthguards that protect your teeth. It is important to do this if you grind your teeth, otherwise they will wear down and even crack.
My wife's dentist said that she has a few cracks in her teeth, and said that Chinese people are particularly prone to this because they tend to have weaker teeth. Even light bruxism can crack weaker teeth (I never noticed that she grinds her teeth)
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