Olaplex No. 0 Intensive Bond Building Hair Treatment (155 mL / 5.2 fl oz) — primes hair for N°3
Product description
The essentials
Olaplex No. 0 Intensive Bond Building Hair Treatment is a salon-inspired pre-treatment designed to “prime” your hair before you use Olaplex N°3 Hair Perfector. The idea is simple: if you start with a treatment that helps prepare and strengthen, your deeper repair step can work better. It’s meant for a wide range of textures—coily, curly, straight, and wavy—so it’s less about your curl pattern and more about the condition of your hair.
On paper, No. 0 is built around Olaplex’s patented bond-building technology. That means it focuses on rebuilding disulfide bonds that support hair structure. If your hair feels weaker, more prone to breakage, or harder to detangle, this kind of “pre-step” can make a noticeable difference in how your routine feels after one session.
Key points
If you regularly bleach, color, or heat-style, you already know hair can get fragile. No. 0 is designed for that specific reality: it’s a pre-treatment that strengthens hair and helps reduce breakage, while setting things up for the N°3 step that follows. It also leans into detangling and conditioning improvements—things you’ll feel the moment you rinse and comb.
A key detail is that the most impressive results are described when No. 0, N°3, and N°4 are used as a three-part system in one use (and there’s also a note about improvements with N°4). That doesn’t mean No. 0 is useless alone, but it does mean the “best case” plan is a multi-step routine.
What you’ll notice day to day
This product is positioned as a primer, not a one-and-done miracle. So instead of expecting it to replace everything, think of it as the first domino in a targeted repair routine.
In practical terms, here’s what that can look like: after shampooing, you apply No. 0 as your pre-treatment, then move on to your next step (N°3 is specifically called out). By the time you detangle, your hair may feel smoother and more manageable, which can reduce tugging. Less tugging usually means less breakage—especially if you’re prone to snags during wash day.
Still, keep expectations realistic. It’s a hair treatment, so if your hair is severely damaged, very over-processed, or you’re constantly styling at high heat, this won’t “undo” everything overnight. It’s more like strengthening and repair support over time.
What stands out (and the limitation)
The strongest selling point here is the way No. 0 is meant to intensify the repair results of N°3. The entry also mentions clinically proven improvements when used as part of the system: 68% more repair and 68% better detangling, improved conditioning, and smoother feel, plus a 65% reduction in breakage—when used as a three-part system of N°0, N°3, and N°4 in one use. That kind of claim is hard to ignore.
Where to be cautious: those results are tied to using the full approach (including N°4, in some notes). If you’re looking for a single-product routine and won’t do the multi-step system, you may not experience the same level of impact described.
Tech specs
- Name: Olaplex No. 0 Intensive Bond Building Hair Treatment
- Type: Pre-treatment / intensive bond-building hair treatment
- Capacity: 155 mL / 5.2 fl oz
- Works for: Coily, curly, straight, and wavy hair
Who it’s for
No. 0 fits well if you want a more “repair-focused” wash day and you already plan to use (or are willing to use) N°3 as part of your routine. It also makes sense if detangling is usually the part that stresses your hair—because the benefits highlighted include detangling and conditioning improvements.
On the other hand, it may not suit you if you prefer a minimal routine or you’re not interested in the multi-step system. It’s also not the kind of product you buy just to add shine for a one-off event—this is geared toward bond building and strength.
Should you buy it?
Buy No. 0 if you’re aiming for deeper at-home repair and you want a primer that supports the N°3 step. It’s a strong choice when you’re dealing with damage-related concerns like breakage or difficulty detangling, and when you’re willing to follow the system approach described.
Skip it if you want a simple, single-step treatment with no follow-up product plan, because the best results in the information provided are specifically tied to using N°0 with N°3 and N°4 as part of a set routine.
If you’re the type of shopper who likes structured care (wash day steps, consistent application, and tracking what changes in texture and manageability), this is the kind of pre-treatment that can earn its spot in your cabinet.
Quick overview FAQ
Does No. 0 replace N°3?
No. The product is specifically described as a pre-treatment to boost the effects of N°3 Hair Perfector, so it’s designed to be used in connection with it.
What hair types is it for?
It’s described for coily, curly, straight, and wavy hair.
What’s the main benefit?
The focus is on bond building—strengthening hair, reducing breakage, and improving detangling/conditioning as part of a repair routine.
Are the results based on using multiple Olaplex steps?
The entry notes clinically proven improvements when used as a three-part system of N°0, N°3, and N°4 in one use, and also includes a note about improvements when used with N°4.