1. This product is disposable and cannot be used after cleaning. It is recommended to wear it for 4 hours continuously and then replace it.
2. The mask should be kept as flat as possible after use, to extend the use time, please do not fold the nose strip above the mask frequently.
3. The air is not smooth, breathing is not smooth or is not recommended to wear during sleep.
4. Children under three years old are not recommended because of their low vital capacity
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