I self-trim when I notice my ends (I have layers) are sticking up way too much. I think they do that when they dried out or split. So, I "dust" all the hair (which I believe means to trim a very tiny bit of all the ends - even less than half an inch). And then I'm good to go! I notice it about every 6-7 weeks, but I haven't really noticed it lately, and I'm probably due for another one soon.
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