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 KERASTASE NEW Elixir Ultime Refillable Hair Oil is designed to smooth frizz and add shine to all hair types. Key ingredients include Wild Camellia, which not only nourishes but also provides heat protection for your hair. This makes it suitable if you frequently use heat-styling tools. The product promises 92% more shine, up to ten times smoother and stronger hair compared to using a non-conditioning shampoo, which is particularly appealing if your hair tends to be dry or unruly.

The lightweight formula ensures that your hair is left soft and not weighed down. For application, simply use one or two pumps on the mid-lengths and ends of your hair whenever you need extra shine during your styling routine. The refillable design and the use of 30% recycled glass for the bottle demonstrate a commitment to sustainability.

However, the 30-milliliter volume might feel limited for those with longer or thicker hair, requiring frequent repurchases. The product's camellia scent is pleasant but might not suit those who prefer fragrance-free options. Additionally, as a high-end product, it could be on the pricier side compared to other hair oils. This hair oil is ideal for someone looking for a premium product that offers both heat protection and significant improvements in hair shine and smoothness.

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.