I'll admit that sometimes I'm a bit hard on my paintbrushes. I tend to leave them in my water glass for a days on end. This is a big no-no, but I do it anyway. Call me a rebel if you must. Well after doing this a few times, the tips of the small brushes can get a bit bend looking.
Here is how I fix that. I take a sharp pair of scissors and cut straight across. I now how something like a stipple brush. It doesn't serve it's original purpose but it works.
*Side note: I use synthetic bristle brushes. Mostly because I don't like the idea of using animal hair brushes, but they are usually cheaper as well. So, no animals were harmed in the making of this art. ;)*