The Shelf · Hair · Surface Tension: Treatments That Work Inside the Hair, and the Ones That Only Coat It
Olaplex No.4 Bond Maintenance Shampoo
The wash-day step of the patent that started the bond category. The No.7 oil already lives on this shelf; this is the maintenance shampoo built on the same molecule, which makes it the rare shampoo that belongs to the repair half of this edit rather than the cosmetic half.
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Why we like the No.4 Bond Maintenance Shampoo
- The original patented bond chemistry, in the shower
- Maintains salon treatments between visits
- Pairs with the oil this shelf already keeps
- Texture
- A low-lather bonding shampoo
- Key ingredients
- Bis-aminopropyl diglycol dimaleate
- Fragrance
- Scented
- Best for
- Chemically treated hair · Maintaining salon repair at home · Pairing with the No.7 oil on this shelf
- Works on
- Damage · Breakage
- Made in
- USA
- Where to buy
- Amazon
- Price
- $32.99, approximate
- Listing checked
- 2026-08-28
Our verdict on the Olaplex No.4 Bond Maintenance Shampoo
Bis-aminopropyl diglycol dimaleate on wash day, at thirty two ninety nine. It lathers less than you expect.
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Reviewed 2026-08-28. Olaplex No.4 Bond Maintenance Shampoo appears in Surface Tension: Treatments That Work Inside the Hair, and the Ones That Only Coat It. Every product on The Shelf is listed in the product index.