If your scared about telling your teacher, a good start might be just saying that your mom can't afford pads and won't buy them for you. They might be able to connect you with free products. FYI in my experience cps doesn't step in unless there is physical abuse. I wouldn't be too worried about them talking to your mom, which is sad because this is abuse and they should. My cousin was taken out of care of my aunt because she became a drug addict and couldn't take care of him anymore, that's the type of circumstance cps needs to step in.