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yingtso mark this message contains misinformation
｜originally written by yingtso
若是反過來穿戴口罩，則因吸水層朝外，可能吸附外在的含菌飛沫，而防水層朝內也會因口沫、水氣無法吸附，使穿戴口罩者感到潮濕而不舒服。
—衛福部食藥署闢謠專區

References

https://www.fda.gov.tw/tc/newsContent.aspx?id=21533&chk=36ce892c-b925-4321-9d02-12488e66edc3

最近流傳口罩的正確戴法，隨病狀不同而有口罩內外戴的差異，請問這是真的嗎？-衛生福利部食品藥物管理署

解答：    最近有人流傳口罩的正確戴法，病患戴口罩應將白色織布罩口，綠色面朝外，健康者則是將綠色面罩口，白色面在外，隨病狀不同而有口罩內外戴的差異，請問這是真的嗎？ (1)      醫用口罩依照不同功能與設計，分為執行手術穿戴的外科醫用口罩(屬第2等級醫療器材)及其他醫用口罩(屬第1等級醫療器材)，主要是用來阻擋飛沫接觸口鼻的用具，防止病患與醫護人員之間微生物、體液及粒狀物質的傳遞與感染。 (

https://www.fda.gov.tw/tc/newsContent.aspx?id=21533&chk=36ce892c-b925-4321-9d02-12488e66edc3
The reply is used in the following messages
There are 2 sides of surgical mask, commonly with green/blue color side and white color (contains filter). The corrective ways of use are:

- If we have flu, the white side should attach to our face (the color side faces out) to filter the micro-organism not to spread them out to others

- If we are not ill, the white side should face out to protect micro-organism from environment to come to contact with us

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