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Those companies then carve out space for that new category in their own lines.

hand holding section of healthy hair

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That has both good and bad consequences.

More accessible price points.

Companies got wise to the fact that the term bond builder doesnt have a legal meaning, says Romanowski.

Olaplex No. 5P Blonde Enhancer Toning Conditioner purple bottle with white label on light gray background

So, theyve taken to calling things that mightelectrostaticallybond to hair bond builders.

But this is pretty much how allhair conditionerswork.

So how can you tell the difference between the real deal and a deep conditioner?

K18 Leave-In Molecular Repair Hair Mask squat white bottle on light gray background

(Deep conditioners are also good for your hair, but they are not a bond builder.)

What are bond-repair products?

Your hair is naturally made up of a bunch of chemical bonds too small for the eye to see.

Joico KBond20 Defy Damage Power Masque silver and purple tube on light gray background

Bond-repair products are meant to help fix them and improve hair health by using similar chemistry.

OK, but how do bond builders work?

Bond builders work by rebuilding the S-S bonds, says Robinson.

Aveda Botanical Repair Bond-Building Flash Treatment teal squeeze bottle on light gray background

Olaplex

Olaplex No.

“The dimaleate part helps to prevent disulfide bond damage, often seenduring bleaching,” King says.

K18’s products achieve similar results with a different ingredient.

L’Oréal Paris EverPure Sulfate-Free Bond Strengthening Shampoo light pink chrome tube on light gray background

Do bond builders make a difference for damaged hair?

But they may not be able to revive dead hair fully.

It is, in effect, a bandage.

Kenra Professional Triple Repair Shampoo blue and yellow bottle with black cap on light gray background

How should I decide which bond repair products to use?

Too much proteincandry out your hair, says Dr. Osted.

Unless you are using a leave-in product, nearly all of the protein is simply rinsed down the drain.

SheaMoisture Bond Repair Conditioner transparent bottle with green label and gold pump cap on light gray background

Again, it is just a compelling marketing story that proteins are helping your hair.

When in doubt, ask your stylist.

There likely isnt going to be a one-product-fix-all solution.

Garnier Fructis Hair Filler Moisture Repair Cream Treatment light green tube on light gray background

It also coats hair in lipids, which protects hair from pollution and environmental damage.

It also smells like a lush Balinese garden, which is reason enough to work this into our routine.

(Now thatschouette.)

Function of Beauty Pro Bond Repair Custom Leave-In Treatment for Damaged Straight and Wavy Hair light blue bottle with white pump cap on light gray background

(Though, we wont discourage you from indulging in ahair maskjust for self-care.)

Its also formulated with amino acids to help repair damage from heat, color, and protective styles.

I love that it gives hairstyles some hold and will help to define curls, says Toth.

Senior editorJesa Marie Calaorloves its lightweight texture and how it defines her medium-coarse, wavy hair.