[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

声波震动牙刷频率31000-40000次/分为主流有效区间,低于25000次/分清洁力明显不足,但盲目追求超过40000次/分对牙菌斑清除提升有限反而增加牙龈刺激

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