I always have a problem with my lips because I bite them a lot. I know you are curious about how do I avoid biting them. Well what I usually do is just use a lip balm. Using a lip balm helps me a lot. I actually do stop biting them when I'm wearing it. A little tips for you, try to put lots of lip balm on my lips before bed time. It is because when you wake up the other day, it will looks so much better.
Marine Elements lip balm is slightly pricer than Labello.