Many women, such as myself, have this very same problem, and a lot of them get extensions to fix this. When extensions are high quality and applied by a certified stylist, you wouldn't even know they were in. You probably see a lot of celebrities with gorgeous long, voluminous hai,r and the truth is, about 90% of them wear extensions.
When thinking about extensions, many women think length. But extensions can be used for all sorts of things such as volume and even chemical-free highlights. And some brands are way more affordable than you think. I have done a lot of research on this, and found the higher end, high quality hair extension brands are Great Lengths, Hair Dreams, Cinderella Hair, etc. They can be pretty pricey. There are other brands out there, though, that maintain that high quality standard but are a 1/3 of the cost.
One of these brands that I found and love is Tony Odisho Extensions. They use a keratin protein bond which doesn't damage the natural hair whatsoever. When applied by a certified stylist, and taken care of properly, they can last up to 6 months. Sometimes I forget I even have mine in! I called and they found me a certified stylist in Chicago where I live. They have the cities that certified stylists are available right on their (Link deleted per
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I love my extensions, and I love the fact that I don't have to worry about my hair being thin and hard to style anymore!