What to do about nails?

My fingernails aren't very strong & tend to break and split unevenly quite a lot. As a result I too often end up biting them to try to stop them getting ragged & catching on clothes, etc.

I do cut/treat them with a basic manicure set, but that's not always available (especially on aeroplanes ! :P). I don't think I do a very good job, though - they never seem to grow back any better than before & end up tearing/snagging again :/

Ideally these nails would always be smooth & clean: I think most girls can imagine why ;)

Any suggestions on ways to strengthen them or get them fixed up? Manicure shops are such a female domain I'm sure they'd just stare at me in astonishment if I turned up.

What to do about nails?
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