How can I stop my pin biting?

I am a nail biter. I do it when I am bored, hungry, stressed out, anything. I own tried painting them but I termination up peeling the polish past its sell-by date with my teeth instead. I know this is a desperate habit and I really want to break it. I am worried it is going to mess up my teeth. I have tried gum and the polish that swallow bad. I aversion wearing fake nail so I can't do that.
What is an effective track to stop biting them?
Serious answers please.
Answers:

Am i pregnet?

okay. i was a serious biter until i be 15. seriously, my nails be basically non-existant because i bit them so much. what i did be i willed myself not to bite them. i looked at my friends who be really pretty and would go win their nails done, and i couldn't do that because i didn't hold any. so i used the nail hardener and i put on resembling 20 coats so that it was really really really really concrete and i just wasn't competent to bite them anymore. also, gum doesn't help. but if you chew on resembling gummy bears or something that requires you to swallow, you prolly won't bite your nail while eating them ( i said gummy bear because most people don't gain counterweight eating those)

suitable luck!

Depo-Provera?

Here's one thought-
whenever u feel resembling biting your nails, if u bite both your mitt's nails afterwards think of this that u use ur gone hand for some private work and indistinguishable nails of this appendage are a magnet for all the germs u lift from there and whenu bite them u r ingestion this really harmful germs! suggest of this and u may get frightened of getting some disease or so and will stop biting them! sorry if i am blatant but i have to say what i touch could be done to help u! god luck!

I own an under productive thyroid and am wondering if that can result in fertility problems?

TRY TO USE GUM PUT SAUCE IN YOUR NAILS.

What is my problem?

Go get your nail done. That will definately put a damper on the biting. You could also soak them in hot sauce or lemon juice.