这种疾病的最初症状就是张嘴困难，又叫做牙关紧闭症，以及吞咽困难。
The first signs of this disease include difficulty opening the mouth - often called lockjaw - and difficulty swallowing.
可能的诱发原因：虽说都叫磨牙症，但磨牙的情况各不相同，从牙关紧闭到疯狂磨牙直到牙齿只剩残根。磨牙通常是由遗传或压力造成的。
Likely cause: Known as bruxism, teeth-grinding varies from jaw clenching to ferocious grinding that wears teeth down to stumps. It is usually due to genetics or stress.
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