[KongchangAI]
Unverified90% confidenceTradeoffTime unknown

声波式牙刷振动频率31000-48000次/分钟,靠高频微振动+液体流动清洁,对牙龈刺激小;旋转式(如Oral-B)为3D旋转摆动,机械去渍力强但对牙龈娇嫩者刺激更大

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90%
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Long-term
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