How do I stop biting my lips?

I have asked this question before on here and was told to try chewing gum. It worked for a little bit then with out noticing, I started biting them again. Recently some pretty frustrating and anxious stuff has been happening and they look HORRIBLE. (My sister pointed out the barrier between the bitten part and non bitten part today and how bad it looks) Any ideas?
How do i stop biting my lips??
How do I stop biting my lips?
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