Ashley Greene believes wearing make-up constantly can be ''Dangerous'' for your self-esteem.

The 25-year-old 'Twilight' actress often forces herself to go bare-faced, just to ensure she doesn't become too emotionally dependent on beauty products.

She explained: ''I think it's dangerous to get too comfortable with needing makeup. You kind of Lose Yourself, and you don't think you're pretty without it. It creates this whole downward spiral.''

Now considered something of a style icon, the natural brunette admits she has made many a style faux pas in the past, particularly with her hair.

She told ''My hair's been every colour under the sun, and some are good and some are bad.

''I think the biggest mistake I ever made was when one of my friends was like, 'You should just iron your hair with an iron'. It was not good at all. It was just stick-straight. I was probably around 14 when I did that; I did a lot of dumb things at 14. That was bad.

''I used to also scrunch my hair. I used entirely too much hair gel. It was highly flammable, extremely crunchy. I feel you like you could break it. It was not a good look for me.''

But with her teenage years firmly behind her, the actress is looking forward to the body confidence she has heard comes with being over 30.

She added: ''I'm definitely the most comfortable in my skin than I've ever been. I understand that a lot of things aren't the end of the world. I'm finally to a spot where I'm comfortable. And my mom said she loved her 30s. She was most comfortable in her 30s. So I'm looking forward to that.''