What do you mean by breaking down in cosmetics?

pu1. It means that it gets dirty as soon as you put it on, and it's okay at first, but it gets dirty over time

2017-12-05

OK

pu2. It's a few hours after you apply it, the foundation gets lumpy, floats, flies, or gets stuck in your pores

2017-12-05

OK

pu3. You can tell when it breaks down over time, and when it floats, it floats as soon as you apply it

2017-12-05

OK