There were significant difference be-tween the two groups (P< 0. 01). Conclusion ECP can reduce the incidence of vessel wall injury, preventing plaque formation.

两组存在明显差异（P<0.01）。结论 体外反搏治疗可以降低血管壁损伤发病率，预防斑块形成。

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White protective layer formation, long-term protection of the teeth, reduce plaque regeneration.

形成亮白保护层，长效的保护牙齿，减缓牙石再生。

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Regular use of Xylitol has been shown to help reduce dental plaque - the first stage of cavity development, tartar formation and tooth staining - and promote better oral health.

有显示说常吃木糖醇有助于减少齿菌斑——蛀洞，牙石，牙渍形成的第一步——还有提高口腔的健康。

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