The truth is out of my own personal experience, I found that with time it just got worse, I started out doing shallow ones on my legs with scissors, I thought it was gross done on the arms. Now 6 years later I have scars all over my arms, ribs, legs, and hips that I did using so many different things. There's no real safe cutting. I learned that, but it took me a long time, you may start out doing little shallow cuts, but eventually over time they get deeper. And eventually you depend on it so much that when you can't find something sharp to do it, you panic, I can't speak for everyone who cuts, but thats how i was.