[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

3岁以下幼儿建议选择带弯柄的Y型牙线棒(弓形夹角设计),家长单手可操作后牙区;直柄I型牙线棒适合能配合的5岁以上儿童练习自主使用

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