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prettypithy IMO, if it's been while since you last trimmed or if you didn't get rid of all previous damage--not always easy to tell unless someone is looking for you, so sometimes you may have to go by a hunch of how your hair looks and feels and behaves to know how much of your ends are not right--then you may find this first trim (First as in, "since you understood how this works") may be a huge one. Once you get rid of all damage that you have now, the trick now is follow the rule that "prevention is better than cure" and start to take measures so you never have to cut that much again.
First make it a point to moisturize and seal ends to preserve them. (If you think of hair as a cylinder, the end is open so is the first to lose moisture even from the inside...and so it needs all the TLC it can get). Then if you can protective style (meaning, wear your hair in styles where your ends are protected, at least most of the time even if not all the time, you further help preserve your ends by keeping them from rubbing on your clothes (friction wears them down) and from the elements (wind and sun are elements that help things dry.)
Next, you set a dusting schedule. Remember "dusting is cutting off a sprinkling of your hair" and it's way smaller than a trim. Until you feel comfortable with something different, to start off you could use the guide that many people preach and follow (It's the one I use): that is, dust off a tiny bit every 6-8 weeks. People panic when they hear the advice to trim off 1/4 inch in that time. But if you take your ruler and look at what is being asked of you, it's this much __. That's all you'd be loosing in 6-8 weeks. Hopefully that will take care of the problem and be enough to preserve your hair.
You may find a little more than that is what feels right to you. But start off with that little...and if you still spot splits down the road then maybe you need to dust at 6 weeks not 8. But I can assure you that by trimming sooner than when you NEED it, you will be cutting off way less than you were doing waiting to do a proper trim when things look bad. And even if you find you end up cutting the same amount as when you wait, that your hair didn't get a chance to get weak in the first place means less of it broke off on its own...so really, you are retaining better.
I share the story of how I confirmed this theory to be true in a few posts. Here's one:
http://www.longhaircareforum.com/showpost.php?p=10375716&postcount=9
HTH
ETA: Just wanted to add that some people will tell you that trimming that much would just be trimming away your growth. Not true. Waiting is way more likely to cost you your growth. If you dusted 1/4 inch every 2 months (8 weeks), in a year, that's just 1.5 inches trimmed. And if you took great care of your ends and had full retention of what you didn't cut, then in one year at average growth, you'd have 4.5 inches; in two years you'd have gained 9 inches; in 3 years, 13.5 inches. And icing on the cake is: see-through ends or unsightly ends will not be something you will have to deal with.
E (again) TA: @
Your Cheeziness, I just saw your post after submitting mine and have to ask: can you please be my editor? :notworthy You're like that pill my doctor ordered to cure verbosity.
(I think I'ma start making
Polyjuice potion to take just before I start posting to become you. Can you please send me some of your hair by
owl before midnight please?)