I don't check his nails. (He's an adult. He takes care of his own hygiene.) My Man works with his hands a lot, so his nails are usually worn down. He is also a very clean man, so I don't have to worry about dirty fingernails. I see him biting them from time to time, but I've never ever seen him with a nail clipper or a file.
If he has a hangnail or something I'll just let him know (because I feel it) and he'll bite it.
My nails go from natural (very short) to fairly long, if I am using artificial nails, but I am careful with his tender areas.