In Canada children aged 2-12 can be struck, but not with objects or on the head: "minor corrective force of a transitory and trifling nature" is allowed.
加拿大允许体罚2 - 12岁的孩子，但不能使用工具或击打头部，“暂时、轻微的体罚”是可以的。
Results There was a good recovery of alveolar bone after arrachement, and under the effect of corrective force , the hyperplasia and absorption continually occurred with height reduction.
结果拔牙术后牙槽骨愈合良好，在矫治力的作用下，牙槽骨不断出现增生和吸收，并且高度降低。
Results There was a good recovery of alveolar bone after arrachement, and under the effect of corrective force , the hyperplasia and absorption continually occurred with height reduction.
结果拔牙术后牙槽骨愈合良好，在矫治力的作用下，牙槽骨不断出现增生和吸收，并且高度降低。
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