10 Best Hair Smoothing Products 2025 in the United States

The Olaplex No. 6 Bond Smoother is a leave-in hair cream designed for all hair types that aims to smooth, condition, and strengthen hair. One of its notable strengths is the ability to control frizz for up to 72 hours and provide humidity resistance, making it ideal for those living in humid climates. Additionally, it offers heat protection up to 450F, which is beneficial for users who frequently use hot styling tools.

The product also promises to moisturize, repair, detangle, and reduce breakage, thus contributing to healthier hair over time. As a vegan product, it appeals to those looking for cruelty-free options. Users will appreciate that it can speed up blow-dry times while delivering a smooth finish and eliminating flyaways.

On the downside, the product's 3.3 fl oz size may seem small for the price to some users, especially if used regularly. Also, while it is designed for all hair types, users with fine hair might find it too heavy depending on how much is applied. Despite these considerations, its multifunctional benefits make it a strong contender in the hair-smoothing product category.

The Living Proof Perfect Hair Day Heat Styling Spray is designed for all hair types and offers smoothness that lasts up to 48 hours. One of its strong points is heat protection up to 450°F (230°C), which helps shield hair from damage when using hot styling tools like straighteners or curling irons. Its ultra-fine mist allows for an even and light application on both damp and dry hair, making it versatile and easy to use.

The formula is free from common harsh ingredients such as formaldehyde, parabens, phthalates, silicones, and sulfates, which is a plus for those looking for a gentler hair product. The spray also has a pleasant vanilla scent that most users find appealing. However, while it protects hair from heat and extends smoothness, it does not provide strong hold or styling control, so it might need to be paired with other products if you want firmer hold or volume.

This spray is a solid choice for anyone wanting to reduce frizz, protect hair during heat styling, and maintain a smooth finish, especially if you prefer lightweight, non-sticky products.

The Kerastase Nutritive 8H Magic Night Hair Serum is designed to hydrate and nourish dry hair overnight. It's suitable for all hair types and aims to reduce frizz and detangle hair by morning. The serum contains plant-based proteins and niacinamide, which help retain moisture and strengthen hair. It also protects hair from pillow friction, ensuring it remains smooth and shiny without transferring onto your pillow.

The application is simple: apply one to two pumps to dry or damp hair before bed and leave it in overnight, with no need to rinse in the morning. Users are recommended to use it three nights a week for optimal results. On the downside, the product size is relatively small (3.04 Fl Oz), which might require frequent repurchasing for those with longer hair or those who use it regularly.

Additionally, while the citrus scent may be pleasant for some, it could be overpowering for others. This product is ideal for individuals experiencing dryness and frizz, looking for an easy-to-use overnight treatment to improve their hair's health and appearance.