Best Chemical Hair Straighteners of 2025

"I don't usually write reviews, but this product really impressed me! The only downside was that it took a lot of time (3 hours) and the scent was quite potent. Even with a window open, my eyes were watering. But aside from that, it worked wonders! My hair is now shiny, smooth, and straight. I'll definitely be purchasing this again."

"I have thin hair, which might have made the application easier. The amount of product was more than sufficient for my shoulder-length hair, and the entire process only took me about 1.5 hours. The outcome was fantastic - smooth, silky hair. The scent was intense but bearable with all the windows open. I watched a few YouTube videos to ensure I was comfortable with the procedure."

"I have 3A type curly hair which is usually very frizzy and hard to manage. I've been wanting to try a Brazilian blowout and decided to give this a shot. It truly smooths out my hair and reduces frizz. This is my second time using it. It slightly relaxes my curls to about a 2B. I gave it 4 stars instead of 5 because it only seems to last 2 or 3 weeks at most. Does anyone know how to make it last longer?"

"Firstly, regarding the application, the fumes were quite strong. I used the product in my bathroom with a box fan for ventilation, but the fumes still irritated my eyes and throat. I had to pause multiple times during the application process. I'm not eager to repeat that experience.

However, the results were impressive. My hair, which is long, wavy, frizzy, and color-treated, felt fantastic after the treatment. It's usually hard to manage during the humid summer, but this product helped to control it. Seven weeks later, the waves have returned, despite my careful use of sulfate and sodium-free shampoo and conditioner and washing my hair every 4-5 days."

"I live in the very humid region of South Georgia, close to Florida. My hair is naturally curly, extremely coarse, and very frizzy. I don't mind the curls, but I despise the frizz and puffiness. I've had similar treatments at a salon but I'm not fond of the cost. My hair is shoulder-length and I only used half the bottle. The process was time-consuming, but no more so than a salon visit.

The product made my eyes water slightly when I was blow-drying and straightening my hair near my face. I followed the instructions exactly and didn't wash my hair for 3 days. I do wish my hair still had a bit of curl, but I'm happy to trade that for a lack of frizz. I will definitely use this product again and highly recommend it!"

"I never write reviews, but I had to for this! It saved my hair and self-esteem! After moving to a humid state, my curly hair was a mess. I almost shaved it all off. Then I found this GLORIOUS solution that gave me the hair of my dreams! It's completely straight and not frizzing up. Life-changing! Just buy it!"

"I've tried many blow out kits and even had salon treatments, but this is my favorite! It completely transformed my hair's texture. Now it feels soft and light instead of heavy and dry. I did apply it for about 6 hours and slept with it in, but the results are worth it. Highly recommend!"

"I had no idea how to handle my frizzy grey hair, but this product impressed me! It took a while to apply, but my hair is no longer frizzy. I even did my fiancé's curly hair, and the results were fantastic! Thank goodness I found this! It’s a game-changer for frizz!"

"This product is the OG keratin treatment! It works phenomenally well for my long hair. I used about 1/4 of the bottle and left it in for 3 days. The result after washing? Just straight silky softness! I used to waste hundreds on salon treatments, but now I can achieve salon quality results myself. Love it, just buy it!"

"I hardly write reviews, but this product absolutely deserves one. As someone with thick, wavy/curly hair, I've tried many treatments, but this one impressed me. The process was a bit tricky, and it took about 4 hours, but the results? Incredible! My hair dried nearly straight and soft with almost no frizz. I used to spend 1.5 hours styling, but now it’s just 5-10 minutes. I’m incredibly satisfied!"

"I am transitioning from a pixie cut and chose to try a bowl cut. This product worked wonders! My hair is now heavy, straight, and perfectly shaped. The drying process took a bit longer due to my thick hair, but the results were absolutely worth it. I recommend starting with very dry hair and working in small sections for the best outcome."

"I have long, frizzy gray hair that just keeps getting frizzier. After watching some YouTube videos, I decided to give this product a shot. It took some time, about 3-4 hours, but I’m thrilled with the results! My hair is now straight and manageable, and I would definitely purchase this again."

"As someone with naturally curly hair, I was hesitant but hopeful about this treatment. While the results were effective, I experienced some color fading back to a reddish-brown tone, which was disappointing. The included gloves were not very functional, so be prepared with your own. Overall, the product works, but the application process can be quite fume-y."

"I have been using Glatt Hair Straitening Cream for several years and absolutely loved it, but unfortunately, this time it did not produce the same results. It did not straighten nor relax my hair, which left me feeling really disappointed!"

"To my surprise, I had no idea this product would work so well. It made my hair amazingly smooth and straight, exceeding all my expectations!"

"Overall, I am just not satisfied with this product. It’s not what I was expecting at all."

"I was nervous about trying a keratin smoothing treatment at home, but after using this product, I was thrilled with the results. My stubborn curls turned into gentle waves, and my hair felt soft and shiny after blow-drying. The process was much easier than I expected, and I love that it didn't irritate my scalp. I waited two days to wash my hair, and while the keratin smell returned slightly when wet, it disappeared once dry. This is my go-to product now!"

"Living in Puerto Rico's heat and humidity, I initially applied too much product. However, even after leaving it on overnight, my hair remained manageable and frizz-free for almost a month. I still have a bit of curl, which I appreciate. The cost and convenience of this product are unbeatable!"

"I was hesitant to use any smoothing products on my heavily bleached hair, but this one surprised me. There was no harsh smell, and following the instructions led to amazing results. My hair turned out completely smooth and hydrated without needing a flat iron. I'm excited to see how long the treatment lasts!"

"I am absolutely floored with the results! My hair is now silky smooth, manageable, and tangle-free after using this treatment. I was able to achieve results I've never seen at home before. The process took some time, but it was worth every minute!"

"I was really disappointed with my experience. When I opened the kit, the bottles were practically empty, and I couldn't even apply enough product to my medium-length hair. Despite following the instructions perfectly, I saw absolutely no results and felt like I wasted my money."

"I had extremely curly hair and tried everything to straighten it. This treatment was a game changer for me! The process was time-consuming, but the results were amazing. My hair is now beautifully straight and so much easier to manage!"

"I have 4C (NAF) hair and was struggling with breakage from transitioning from perms. I was skeptical at first, but after using this treatment, my hair became super washable, smooth, and soft! I did experience some smoke during the blow-drying and flat-ironing, so I wore a mask, but it was worth it. My hair lasts through humidity and even gets wet as long as I dry it after. I can't believe I found something that works better than perms!"

"I've used this product for years and the results are consistently excellent. My hair is shiny and smooth without damage. However, I do want to mention the horrible smell and the fact that it sometimes turns my hair an orange color. But once I dye it again, I'm more than satisfied with the outcome!"

"This keratin hair straightener is fantastic! I used to pay $400 at the salon for results that only lasted six weeks. Now, for just $25, I get multiple treatments and my hair is completely frizz-free. I highly recommend this to anyone looking to eliminate frizz!"

"I was really looking forward to trying this product after seeing all the rave reviews and pictures. I followed the instructions perfectly, and my hair turned out AMAZING! It was incredibly straight and shiny, which I had never managed to achieve before. Even though my hair went a bit wavy and frizzy after washing it, it’s still way more manageable than my usual curls. I'm definitely planning to use this treatment again!"

"I had never attempted a treatment at home before, but I decided to give this a shot since my hair was dry and damaged. The instructions were straightforward and I was able to do the treatment while working from home. The next day at work, everyone complimented me on my hair! My only minor issue was that the plastic cap was a bit flimsy and broke easily, but overall, I totally recommend this product!"

"This product is simply wonderful! I loved how it left my hair smooth and shiny, and it didn't have any unpleasant chemical smell. After washing out the product, my hair felt noticeably lighter. I can't wait to see how it looks after a few more washes!"