Olaplex Complete Guide: No. 3, 6, 7, 8, 9 Explained

If you have bleached, colored, or damaged hair, you have probably heard of Olaplex. It is the brand that claims to "repair broken bonds" and save your hair from certain death. But with 9 different products and a lot of science-y jargon, it is confusing as hell. I have used Olaplex professionally for years. Here is the real talk on what each product does and whether you actually need it.

What Is Olaplex, Actually?

Olaplex is a bond builder. Your hair is made of protein bonds (disulfide bonds). Bleach, color, heat, and chemical treatments break these bonds. Olaplex's patented ingredient — bis-aminopropyl diglycol dimaleate — actually reconnects broken bonds at the molecular level. It is not conditioner. It is not a mask. It is bond repair, and there is nothing else on the market that works quite the same way.

Think of it this way: imagine a chain-link fence where some of the links have been cut open. Regular conditioner coats the fence to make it look nice. Olaplex actually welds those broken links back together. That is why it feels different from anything else you have tried. If your hair is already showing signs of breakage and dryness, our guide on repairing heat damaged hair covers a full recovery strategy that pairs perfectly with Olaplex treatments.

The Complete Olaplex Lineup: Every Product Explained

Olaplex numbers their products from 0 to 9. The lower numbers are treatments (repair-focused), and the higher numbers are styling and maintenance products. Here is every single one, what it does, and who actually needs it.

No. 0 Intensive Bond Building Treatment — $30

The primer that supercharges No. 3. Salon-grade bond repair at home.

No. 0 is a lightweight liquid treatment designed to be applied before No. 3. It penetrates the hair shaft more deeply than No. 3 alone and primes the hair to absorb more of the bond-building ingredient. In my experience, pairing No. 0 with No. 3 delivers noticeably better results than No. 3 alone — especially for heavily bleached or multi-processed hair. Apply it generously to damp hair, leave it for 10 minutes, then layer No. 3 on top without rinsing.

Apply to damp hair, leave 10 min, then apply No. 3 on top

"Worth it for anyone with serious damage. Skippable for mildly processed hair."

No. 3 Hair Perfector — $30

The hero product. At-home bond builder treatment.

This is the product that put Olaplex on the map. No. 3 is a pre-shampoo treatment that repairs broken disulfide bonds in your hair. It is not a conditioner, so do not expect instant slip or softness while it is on your hair. The magic happens after you rinse and shampoo — your hair will feel stronger, more elastic, and less prone to breakage over time. For best results, apply to damp (not soaking wet) hair from roots to ends, leave for a minimum of 10 minutes (I tell my clients to leave it 30 minutes to an hour for maximum results), then shampoo and condition as normal.

Use 1x weekly on damp hair, leave 10-60 min, shampoo after

"If you buy ONE Olaplex product, make it this one. It is the foundation of everything else."

No. 4 Bond Maintenance Shampoo — $30

Gentle, sulfate-free daily shampoo with bond repair.

No. 4 is a color-safe, sulfate-free shampoo that continues the bond repair process with every wash. It lathers less than a drugstore shampoo (no sulfates means less foam), but it cleans effectively without stripping color or moisture. It is highly concentrated, so you need less product per wash than you would think. A dime-sized amount is enough for most hair lengths. If you color your hair, this shampoo helps extend color life significantly compared to regular sulfate-based shampoos.

Use as regular shampoo — a little goes a long way

No. 5 Bond Maintenance Conditioner — $30

Lightweight conditioner that detangles and repairs.

The companion conditioner to No. 4. It provides good slip for detangling and adds moisture without weighing hair down. For fine hair, use only on mid-lengths and ends. For thick or curly hair, you can apply root to tip. One thing I appreciate about this conditioner is that it does not leave a heavy coating on the hair, so your blowout still has volume and your curls still have bounce.

Apply mid-lengths to ends, leave 3 minutes, rinse

No. 6 Bond Smoother — $30

Leave-in styling cream. Reduces frizz, adds moisture, protects.

No. 6 is a reparative styling cream that you apply to damp hair before blow-drying or air-drying. It tames frizz, speeds up blow-dry time, and leaves hair with a smooth, polished finish. It is not heavy or greasy — more of a lightweight cream texture. I use it on clients who struggle with humidity frizz or flyaways. It also provides some heat protection, though I still recommend layering a dedicated heat protectant on top if you are using hot tools above 350 degrees.

Use a pea-sized amount on damp hair before styling

No. 7 Bonding Oil — $30

Lightweight finishing oil with heat protection up to 450F.

This is my favorite Olaplex styling product. No. 7 is an incredibly lightweight oil that adds shine, tames flyaways, and provides heat protection up to 450 degrees Fahrenheit. A little goes a very long way — 2 to 3 drops is enough for medium-length hair. You can use it on damp hair before styling or on dry hair as a finishing touch for shine. It does not make hair greasy or weigh it down, which is rare for a hair oil. I keep a bottle at my station and use it on nearly every client.

Use 2-3 drops on damp or dry hair

No. 8 Bond Intense Moisture Mask — $30

Deep moisture mask with bond repair. Best of both worlds.

No. 8 is where bond repair meets deep conditioning. If your hair is both damaged and dry (which, let us be honest, usually go hand in hand), this is the product for you. Apply it after shampooing, leave for 10 minutes, and rinse. The results are immediately noticeable — hair feels softer, smoother, and more hydrated. I recommend alternating between No. 3 and No. 8 on a weekly basis. No. 3 focuses more on structural repair, while No. 8 focuses more on moisture and softness. For even more deep conditioning options, check our best deep conditioning treatments roundup.

Use weekly instead of No. 3 if you need more moisture

No. 9 Bond Protector Nourishing Hair Serum — $30

Lightweight serum for daily protection against pollution, heat, and UV.

The newest addition to the lineup. No. 9 is a daily leave-in serum that provides 48-hour frizz control, heat protection up to 450 degrees, and UV defense. It is lighter than No. 6 and works well as an everyday styling product for people who want low-effort, polished hair. Think of it as a hybrid between a hair serum and a leave-in treatment. I like it for clients with fine hair who find No. 6 too heavy but still want frizz control and protection.

Apply to damp or dry hair daily for protection and frizz control

How to Build Your Olaplex Routine

You do not need every product. Here are three routine tiers based on your hair's needs and your budget.

Essential — $30

For mild damage or tight budgets

1. No. 3 Hair Perfector (weekly)
2. Your existing shampoo + conditioner

This alone will make a noticeable difference. No. 3 is the workhorse of the entire line.

Recommended — $90

For color-treated or moderately damaged hair

1. No. 3 Hair Perfector (weekly)
2. No. 4 Shampoo (every wash)
3. No. 5 Conditioner (every wash)

The shampoo and conditioner maintain bonds between No. 3 treatments and protect color.

Complete — $150-180

For heavily processed or severely damaged hair

1. No. 0 + No. 3 combo (weekly)
2. No. 4 Shampoo + No. 5 Conditioner
3. No. 8 Moisture Mask (alternate with No. 3)
4. No. 7 Bonding Oil (daily styling)

The full arsenal. Swap in No. 6 or No. 9 if you prefer cream or serum over oil.

Olaplex Product Comparison

Product	Type	Price	Best For	Priority
No. 0	Pre-treatment primer	$30	Heavy damage	Optional
No. 3	Bond repair treatment	$30	Everyone with damage	Must-have
No. 4	Shampoo	$30	Color-treated hair	Recommended
No. 5	Conditioner	$30	Pair with No. 4	Recommended
No. 6	Leave-in cream	$30	Frizzy hair	Optional
No. 7	Finishing oil	$30	Heat styling, shine	Optional
No. 8	Moisture mask	$30	Dry + damaged	Recommended
No. 9	Daily serum	$30	Fine hair, daily use	Optional

Do You Need ALL of Them?

No. Start with No. 3 — it is the single most impactful product in the line. If you love it, add the shampoo and conditioner (No. 4 and No. 5). The styling products (No. 6, 7, and 9) are genuinely nice but completely optional. You can also pair Olaplex with weekly deep conditioning treatments for maximum hydration, since Olaplex focuses on bond repair while deep conditioners focus on moisture.

Does It Actually Work?

Yes. Olaplex genuinely repairs broken disulfide bonds. I have seen it save hair that was literally breaking off in my hands. Clients who bleach regularly and use No. 3 weekly have noticeably stronger, more elastic hair than those who skip it. The science is real, and the results are consistent.

However, it is not magic. It cannot fix split ends (nothing can — you have to cut them). It cannot repair hair that is so far gone it has no structural integrity left. And it works best as prevention and maintenance, not as a one-time miracle cure. Consistency is everything with Olaplex.

Bottom line: If you bleach, color, or heat style regularly, Olaplex is worth the investment. Understanding the protein vs moisture balance will help you decide when to reach for Olaplex versus a hydrating mask.

Olaplex vs K18: Which Is Better?

K18 is the other big name in bond repair, and I get asked about this constantly. Here is the honest comparison. Olaplex repairs disulfide bonds — the bonds that give hair its strength and structure. K18 targets keratin chains using a bioactive peptide, working to restore hair to its original state from the inside out.

In practice, they work differently and can actually complement each other. Olaplex No. 3 is a pre-shampoo treatment you leave on and then wash out. K18 is a leave-in treatment you apply to clean, damp hair — no rinsing required. K18 tends to show faster visible results (often after a single use), while Olaplex builds cumulative repair over weeks of consistent use.

My professional take: for severely bleached or chemically processed hair, I lean toward Olaplex for its proven long-term bond repair. For clients who want a quick, low-maintenance treatment, K18 is incredibly convenient. Some of my most damaged clients use both — Olaplex No. 3 one week, K18 the next. There is no rule that says you have to pick one.

Tips for Getting the Most Out of Olaplex

Apply No. 3 to damp, not dry, hair. Damp hair absorbs the treatment more evenly. Towel-dry first so hair is not dripping wet.
Leave it longer than 10 minutes. The bottle says 10 minutes minimum, but 30 to 60 minutes gives significantly better results. Some people even sleep in it.
Use it before coloring, too. Many colorists (myself included) add Olaplex No. 1 and No. 2 to color formulas in the salon. At home, using No. 3 the day before your color appointment can help your hair withstand the chemical process.
Do not skip shampoo after No. 3. You must shampoo it out. If you just rinse and condition, you will not get the full benefit.
Be consistent. One treatment will not transform your hair. Weekly use for 4 to 6 weeks is when most people notice a real difference in strength and elasticity.

Frequently Asked Questions

Is Olaplex worth the money?

Yes, if your hair is damaged from bleaching, coloring, or excessive heat styling. No. 3 at $30 lasts 2 to 3 months with weekly use, which works out to roughly $2.50 to $3.75 per treatment. Compare that to a single salon bond treatment that costs $50 to $100. For healthy, virgin hair that has never been processed, Olaplex is overkill and your money is better spent on a good deep conditioner.

Can I use Olaplex with hair color?

Absolutely. Olaplex was originally designed for use during the coloring process. Salon professionals mix Olaplex No. 1 and No. 2 directly into bleach and color formulas. At home, using No. 3 weekly between color appointments helps maintain the bonds that coloring weakens. The No. 4 shampoo is sulfate-free and color-safe, so it will not strip your color. Many of my clients say their color lasts noticeably longer when they use the full Olaplex system.

How often should I use Olaplex No. 3?

Once a week is the sweet spot for most people. If your hair is severely damaged, you can use it twice a week for the first month and then scale back to weekly. If your hair is only mildly processed, every other week is sufficient. The key is consistency — regular use over time delivers much better results than occasional heavy treatments.

Olaplex vs K18 — which should I choose?

It depends on your priorities. Choose Olaplex if you want proven, cumulative bond repair over time and do not mind the wash-out step. Choose K18 if you want a quick, leave-in treatment with fast visible results and less effort. For serious damage, consider using both on alternating weeks. They target different types of bonds, so they complement each other well. Neither is a bad choice — the real mistake is not using any bond treatment at all.

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