Olaplex No.8 Bond Intense Moisture Mask review

Olaplex No.8 Bond Intense Moisture Mask is a concentrated, slippery conditioning mask for hair that bleach and hot tools have left rough and tangly. It does its best work on medium to thick hair that's been lightened more than once, and it asks very little of you beyond a pump or two and ten minutes in the shower. We give it 4.3 out of 5, a strong score held back by how heavy it can be on fine hair and by a small bottle that long hair empties fast.

Read the name with some care, because the word bond oversells what this particular bottle is for. No.8 is a moisture mask first, and a very good one. If softness and slip are what your hair is missing, you can find No.8 on Amazon.

A moisture mask from the bond repair brand

Olaplex built its reputation on a patented ingredient, bis-aminopropyl diglycol dimaleate, which the brand says relinks broken disulfide bonds inside hair damaged by bleach and chemical services. No.8 contains it, but this product's main job sits elsewhere. Olaplex describes it as a highly concentrated reparative mask that adds shine and smoothness while giving damaged hair intense moisture.

The brand itself places No.8 next to No.0 and No.3 when hair needs deeper repair, and that tells you how to read it. This is the moisture half of the Olaplex routine. The bond molecule sits far down the label, behind oils and silicones, so any strengthening effect is a bonus on top of the conditioning.

What it's like on wash day

No.8 comes in a 100 mL bottle, about 3.3 fl oz, and retailer listings describe an airless pump. That pump matters, because the formula is concentrated and the dosing is stingy on purpose. Olaplex's guidance works out to roughly one pump for short or fine hair, two for shoulder length and three for long or thick hair. Expect a dense cream that spreads further than it looks once you warm it between your palms.

Retailer copy calls the texture weightless and says it fully absorbs into the hair. That fits a silicone-led formula used in the right amount, which tends to glide on and leave no greasy sheen. Overdo the pumps and the weightless part disappears quickly.

The routine is easy. Shampoo, squeeze out the water, apply from mid-lengths to ends, work it through with your fingers or a wide-tooth comb, leave it for 10 minutes and rinse well. It replaces your conditioner rather than going on top of it. Olaplex says not to leave it on overnight, and with this much silicone in the bottle you should listen, since extra contact time mostly means extra buildup.

The scent comes from added fragrance, with citral and limonene among the disclosed components, and one retailer files it under a woody aromatic family. Keep it off the scalp if scented products make you itch.

Softer lengths and an easier comb-through

The first payoff is slip. Bleached hair that snags on a comb should detangle far more easily after one use, and once dry it should feel smoother along the lengths, with less of that crunchy, porous roughness at the ends. Shine improves too, mostly because a smoother surface reflects more light.

Dimethicone, the second ingredient, does most of that work by laying a thin film over the hair that cuts friction and flattens roughness. Avocado oil, which sits unusually high for a plant oil, adds a richness that thick, dry hair tends to soak up. Sodium hyaluronate helps hair hold onto water, which is where a good part of the moisture claim comes from.

Olaplex says the benefits last through several shampoos, and a silicone film does hang around longer than a light rinse-out conditioner. The bond side, if you feel it at all, will show up slowly over repeated use as hair that snaps a little less when brushed. Olaplex's own routine points to No.3 if breakage is the real complaint, and that's honest advice.

Where No.8 earns its score

The formula is well built for its target. It gives heavily processed hair a lot of conditioning from a small amount, and ten minutes is a wait most people can manage on a weekday. There's also no hydrolyzed protein on the list, which is unusual for a mask sold on repair. Hair that turns stiff and straw-like after protein treatments can use No.8 every week without that risk.

It also plays well with curls that have been colored. Olaplex suggests two or three uses a week for curly or heavily processed hair, and the slip helps when you're detangling in the shower before styling.

And where it falls short

Fine hair is the obvious problem. Two silicones plus avocado oil is a lot of material for thin strands, and on hair that gets oily by day two, No.8 can leave the lengths limp and the ends looking stringy. Keeping it to the bottom few inches helps, but the formula was never pitched at you.

The bottle size is the other gripe. At two or three pumps per use, 100 mL doesn't last long on hair past the shoulder blades, and for a salon-tier product that adds up. If you avoid silicones, skip it outright, since dimethicone is second on the label and most curl routines that rule out silicones rule out that one.

Who should buy it and who should pass

Buy No.8 if you have medium to thick hair that's been bleached or flat-ironed into a rough, tangly state, especially if protein masks tend to make it brittle. It's also a sensible pick for colored curls that need slip more than they need strength.

Pass if your hair is fine and gets greasy fast, or if your routine bans non-water-soluble silicones. If breakage is the main issue, No.8 alone won't fix it, and Olaplex No.3 is the brand's own answer with No.8 as the follow-up.

How it stacks up against K18 and Moroccanoil

K18's Leave-In Molecular Repair Hair Mask goes after the same bleached hair from the other direction. It's a lightweight leave-in with no silicones or oils, built around a peptide, and it gives you very little slip in the moment. No.8 is the one that makes hair feel soft and combable right away. Plenty of people with heavily lightened hair could reasonably use both, K18 for the repair claim and No.8 for moisture.

Moroccanoil Intense Hydrating Mask is the closer rival on feel. It's also a rich silicone and fatty alcohol conditioner for medium to thick hair, and it comes in a bigger jar with the brand's signature scent. No.8 is more concentrated and better matched to hair damaged by bleach, while Moroccanoil makes more sense for thick hair that's simply dry. If you want to see the current sizes side by side, the Olaplex listing is a good place to start.

Olaplex No.8 is worth it for bleached thick hair, less so for fine

For processed hair that tangles in the shower and dries rough, No.8 is one of the more dependable salon masks around, and its protein-free formula makes it a safe bet for hair that's had enough protein. Fine hair and silicone avoiders should look elsewhere, and anyone with long hair should expect to buy refills often. Our score: 4.3/5, excellent at moisture and slip and fairly ordinary as a bond product. If that matches your hair, pick up a bottle of No.8.