My DD used to bite hers and I used to say each time we were near a chemist, 'should we go and buy some of that horrible tasting nail polish'. She's now nearly 6 and after a good 2 yrs of serious skin and nail biting, this last few months she's finally grown nails that we've been able to paint. We went on holiday and she got her toes done but didn't have any finger nails worth painting. I think that was the final 'click' that she needed. 😄
As a nail biter, and as someone who has a son that is a nail biter, what is the big deal if they do? Their nails might not look "nice" and you might not be able to "pretty them up" with nail polish if you have a girl, but it doesn't hurt anyone else. If they decide that they want to stop, then you can look for solutions. Until then, I would just let them go.
This also reminds me of one other thing I forgot to mention - while I'm not usually too bothered by my nail biting if I notice I'm doing it excessively then I use a nail file to smooth them down completely so there's absolutely nothing there to bite. I still kind of end up sucking on them, but it gives the nails a rest to regrow and recover.
Good luck with it!
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