Xǐyá qíshí bú huì bǎ yáfèng xǐ dà, nà shì yáshí diào le.
Dental cleaning doesn't actually widen the gaps between your teeth — that's just tartar coming off.
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Clinically this is 超声波洁牙 (ultrasonic scaling). Many first-time Chinese patients worry that 洗牙 loosens teeth — the dentistry industry runs regular WeChat public-education posts debunking this. Typically costs 150–400 yuan at a private clinic.