The soft red stain is bacterial plaque.
这种暗红色的染色是菌斑。
This air scaler is intended to remove dental plaque, calculus and stain from tooth surface and tooth root by dental professionals only.
本产品是由资质的口腔科医生在口腔科治疗过程中对患者的牙体表面所粘着的牙垢，牙结石，着色去除时所使用的设备。
This air scaler is intended to remove dental plaque, calculus and stain from tooth surface and tooth root by dental professionals only.
本产品是由资质的口腔科医生在口腔科治疗过程中对患者的牙体表面所粘着的牙垢，牙结石，着色去除时所使用的设备。
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