How to Force Hair Growth

A: The good news is that your hair probably isn't growing at different speeds. What's much more likely is that it only looks that way.
Why the Hair Underneath Seems to Grow Faster
The hair on the top of your head has the toughest job. It's exposed to sunlight, wind, brushing, heat styling, and everyday wear and tear. Over time, all of that can cause dryness, split ends, and some breakage. Even if your hair is growing normally at the roots, those broken ends can make it seem like the top layers aren't getting any longer.The hair underneath, on the other hand, is protected by the layers above it. Because it experiences less damage, it tends to hold onto its length better. As a result, it often looks like it's growing faster, even though it's probably growing at exactly the same rate as the rest of your hair.
Why Bangs Always Seem to Grow So Fast
Your bangs are another story. They always seem to grow incredibly fast, but that's because they're so short to begin with. When your bangs are cut to sit just above your eyebrows, even a small amount of growth is enough to make them fall into your eyes. That same amount of growth on the rest of your hair is harder to notice.
Can You Make Hair Grow Faster?
As for making your hair grow faster, there's no way to force it. Hair growth is determined by your genetics, along with your overall health and the condition of your scalp. Most people's hair grows about half an inch (1.25 cm) per month, although there's some variation from person to person.What you can do is make sure your hair has the best possible environment to grow and prevent it from breaking off.
Healthy Habits
From what you've described, you're already doing several things right. You don't use hair dye, and washing every two to three days is reasonable if your scalp stays healthy and your hair feels clean. Natural oils help keep the hair soft and reduce dryness, so there's no need to shampoo more often.To help your hair reach its full potential, keep your scalp clean, use a good conditioner, and be gentle when brushing or styling. Limiting excessive heat from blow dryers, flat irons, and curling irons can also make a difference over time, because it means less potential damage.
A healthy diet also plays an important role. Hair is made primarily of protein, so getting enough protein, along with vitamins and minerals like iron, zinc, and vitamin D, helps for healthy hair growth. While no food or supplement can speed up growth, poor nutrition can slow it down.
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See also:
How can I accelerate my hair growth?
Does short hair grow faster than long hair?
What is hair made of and how does it grow?