6) Overexposure to sun: Hair that was overexposed during the summer months can be showing signs of weakness and breakage in the fall/winter months. Depending on the extent of weakening, mitigation can range from regular deep conditioning the hair with protein to trimming for a fresh start.
7) Use of an improper comb: Thin-tooth combs or combs with seams can tug on the hair and yield mechanical breakage. Stick to seamless, wide tooth combs.
8) Hair that used to be heat styled: Even if one has not used heat in a while, heat usage from months or even a year prior can be haunting the person now. Mid-shaft splits can be opening and yielding breakage. There is also the issue of split ends widening. Trims are the best way to mitigate this problem.
9) Sleeping on a cotton pillowcase: Cotton can be both drying and abrasive to the hair. Sleep on a satin/silk pillowcase or use a satin/silk bonnet to put a stop to this breakage source.
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10) Hair that has been colored: Dyeing can weaken the hair shaft by lifting the cuticles. Depending on the extent of weakening, mitigation can range from regular deep conditioning with protein to trimming for a fresh start. Here are a few tips for coloring natural hair.
11) Protein-moisture imbalance: Hair can either become brittle or stretchy and thus break due to a protein-moisture imbalance.