She wants to know which strategies are most effective for preserving their health.
她想知道什么办法能最有效地保证他们的健康。
CONCLUSION: The method is easy, feasible, quick, economic and effective in preserving bad tooth.
结论：桩冠修复方法可行，是一种简易、快速、经济、有效的保存患牙方法。
Root canal therapy is an effective method in preserving bad tooth.
根管治疗是保存患牙，避免其早失的一种有效方法。
Root canal therapy is an effective method in preserving bad tooth.
根管治疗是保存患牙，避免其早失的一种有效方法。
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