天然精油驱蚤颈圈附有纯天然植物萃取的驱虫系精油，安全无毒性！

It contains the pest control essential oil abstracted from pure natural plants, safe and nontoxic.

结论：适当浓度的亚砷酸可引起神经轴突的损害，且对全身及周围软硬组织无毒性破坏作用。

Conclusion: Suitable arsenic trioxide concentration can damage nerve axons permanently, and can not bring side effect to the structure around the nerve and whole body.