Is this a leave-in or a rinse-out product?

Leave-in. Apply a few drops to hair or scalp, massage in, and do not rinse. Use it on damp or dry hair.

Will it work on fine or oily hair?

Yes, but use two or three drops on mid-lengths and ends only. Glycerin is a humectant, so a heavy hand can leave fine hair looking limp.

Does it protect against heat styling?

No. The formula lists glycerin and 1,2-hexanediol, with no heat-protectant polymers. Use a dedicated heat spray before flat irons or curling wands.

Can I use it on my scalp?

The directions allow it. Massage a small amount into the scalp if it feels dry, but skip it if you are prone to buildup or oily roots.

How does it compare with silicone anti-frizz serums?

It adds moisture and light slip without silicone weight, but it gives less lasting frizz control and shine. Silicone serums hold styles longer; this one is better for soft, natural finishes.

How much should I use per application?

Start with three to five drops for medium hair, less for fine hair. Add more only on very dry ends.

Where is the Smoothing Detangling Hair Serum cheapest?

At Deal.ai, for $27.98, as of our latest check.

Smoothing Detangling Hair Serum

Sold and shipped by Deal.ai

$27.98Free shipping

Arrives about Nov 14–23, from a US warehouse

No returns for change of mind. If it arrives damaged or isn't what you ordered, or never arrives, report it within 30 days and we refund you in full.

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Price facts

Last seen at $27.98 at Deal.ai on Nov 10.

Our take on the Smoothing Detangling Hair Serum

This is a 50 ml leave-in serum built on glycerin and 1,2-hexanediol, sold as a smoothing and detangling treatment for all hair types. It is a light humectant formula rather than a repair treatment: glycerin draws in moisture, and 1,2-hexanediol acts as a humectant and preservative booster. It suits people who want a quick no-rinse step for flyaways and comb-through, and it travels well. Against silicone-based anti-frizz serums it adds softness and slip but little lasting hold or heat protection, and it has no bond-repair ingredients like those in Olaplex or K18.