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Why does everyone need a toothbrush case? It is proved by authoritative experiments, after using the toothbrush for 3 weeks. It comes from the oral cavity, the moist environment, the storage containers and even the toilet. It¡¯s difficult for us humans to digest the fact that an essential tool in our hygiene, that we literally put in our mouth can be so disgusting. But the truth is that 90% of the halitosis is caused by oral unclean. Toothbrushes may play a huge role in disease transmission and increase the risk of infection. environmentally friendly plastic, food-grade silicone material, odorless, non-toxic and harmless, comfortable feel, attention to every detail.