Is it ok to use facial/beauty products from different brands at the same time?

BT asked: I can buy a toner, soap, moisturizer from a certain brand but sometimes I run out of one or two of these products so I use an old bottle of toner or moisturizer from a different brand that I stopped using. Doesn’t seem that is irritating my face.
But is it wrong to mix [...]

What field of science or technology does medicines and beauty products belong to ?

Antonette M asked: please help me. im so confused. i dont know where beauty products and medicines belong to what field. Your answers will be very helpful!Create a video blog…instantly.

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