How to find that colorful masks are fakes?

Dear, everyone in our company has been using colorful products. Our company has never authorized Taobao to sell, and there are basically no fakes. As long as the seller has a power of attorney, there is no problem. The effect is really good and healthy! In fact, many big brands are expensive, that is, there are many advertisements and the effect is not good. The wool is on the sheep!