Funny you ask... I didn't noticed Luna's "moustaches" until a little time ago, because I decided to buy a flea comb to comb her face between baths to get rid of the food, and then I started noticing I pulled them out without willing to...
She didn't seem to bother, but I felt awful, and since then I just trim them very short... I have not noticed any change in her, like hitting her face, or something, and for sure her hair lies down nicer, so I would say, go, and trim them...
