Bond repair vs. protein: what my hair actually needed

My hair is fine, bleached at the ends and heat-styled more than it should be. For years, whenever it felt weak or stretchy, I bought a protein mask. Sometimes it helped. Sometimes my hair ended up stiff, straw-like and snapping even more. It took a conversation with my colourist to understand why.

Two different kinds of damage

Your hair's strength comes from its internal structure, held together by bonds. Bleach, colour and high heat break some of those bonds. Separately, everyday wear and chemical processing wear away at the protein structure of the hair, leaving it porous and prone to stretching.

Bond-building treatments are designed to help reconnect some of those broken internal bonds. Protein treatments deposit small proteins that temporarily patch and reinforce the outside of the hair. They do different jobs, which is why one can work brilliantly while the other does nothing, or even makes things worse.

How to tell what your hair wants

My colourist showed me a simple test. Take a single strand, wet it, and gently stretch it.

• It stretches a long way and doesn't bounce back (or feels gummy): it may need protein.
• It snaps almost immediately with no stretch: it may already have plenty of protein and need moisture instead.
• It stretches slightly and returns: you're in a good place.

My ends stretched like chewing gum. My roots snapped. Same head, two different needs.

"Protein isn't a cure-all. Too much of it can make fragile hair more brittle."

What I changed

I stopped putting protein masks on my whole head. Now:

1. Once a week, a bond-building mask from mid-lengths to ends only. I've been using the Fern & Ash Bond Rebuild Mask, left on for ten minutes under a shower cap.
2. Every wash, a lightweight, protein-free conditioner on the lengths.
3. Once a month, a protein treatment on the ends only, if the stretch test says I need it.
4. Always, a heat protectant and my straightener turned down from 230°C to 185°C.

That last change probably did as much as any product.

Three months later

My ends snap noticeably less when I brush them. I've had one trim in three months instead of the usual two. The colour holds a little better, too, though I'm not sure how much of that is the mask and how much is the lower heat.

I did overdo it once. Using the bond mask twice a week for a fortnight left my hair stiff and dull, so I went back to once a week.

The verdict

If your hair is chemically processed, a bond-building treatment is worth trying, but it isn't magic and it doesn't replace a trim. Do the stretch test before you buy another protein mask, treat your lengths and roots differently, and turn the heat down. Your hair will thank you.