The Science Behind Our Hair Products, How Do They Work?

Your shampoo, conditioner, oils, and serums all do completely different jobs. When you understand what each one is supposed to do, you stop wasting money on products that overlap and start getting results that actually last. Most of my clients are shocked when I tell them they are using five products that all do the same thing while skipping the one thing their hair actually needs.

I am not going to bore you with a chemistry lecture, but knowing the basics of how your products interact with your hair changes everything. Once you get it, building a routine becomes simple instead of overwhelming. You will also stop falling for marketing claims that sound good but mean nothing.

I'm Bri, a stylist at The Warehouse Salon in Fairfield and Studio 360 Salon in Chatham. I have this conversation with clients constantly because so many people are frustrated with routines that are not working. Let me tell you about one client who finally got the hair she wanted once she understood what her products were actually doing.

Why Is My Hair Routine Not Working?

Marissa walked into my chair ready to give up. She was a 32 year old accountant in West Caldwell who had tried everything she saw on TikTok and Instagram. Shampoo, conditioner, hair mask, oil, serum, heat protectant. She had a whole cabinet full of expensive products and her hair still looked dull and felt like it had a film on it.

"Bri, I do not get it," she said. "I follow all the steps. I use good products. Why does my hair look worse than when I did nothing?"

I picked up a strand of her hair and I could feel the problem immediately. It was coated. Layer after layer of product sitting on top of each other, none of it actually getting into her hair. She was suffocating her strands with stuff that was all doing the same job.

"You have five products here that all coat the outside of your hair," I told her. "Nothing is getting in. Your hair is not moisturized, it is just covered in gunk."

She looked at me like I had just told her everything she knew was wrong. Because honestly, it kind of was. But two weeks later, after we rebuilt her routine based on what each product actually does, her hair was shinier and lighter than it had been in years. She went from seven products to four and got better results.

What Each Product Is Actually Supposed to Do

Here is the thing nobody tells you. Your hair has layers, kind of like an onion. The outside layer is called the cuticle and it is made of tiny overlapping pieces like shingles on a roof. When those shingles lay flat, your hair looks shiny. When they are raised up or damaged, your hair looks dull and feels rough.

Underneath that is where your hair gets its strength and bounce. That deeper layer is where real damage happens when you color or heat style. Some products work on the surface. Others actually get inside. Marissa was using all surface products, which is why her hair felt coated but still broke and looked lifeless. Nothing was getting to where the damage actually lived. For more on this, check out my blog on What Is The Best Shampoo For My Hair Type.

How Does Shampoo Clean Your Hair?

Shampoo has ingredients called surfactants that grab onto oil and dirt. One end of the molecule loves water, the other end loves oil. When you lather up, the oil loving end attaches to the gunk on your scalp and hair, and the water loving end lets you rinse it all away. That is why your hair feels squeaky after shampooing. The oil is gone.

Marissa was using a super gentle shampoo because she thought gentle meant better. But gentle was not strong enough to cut through all the serums and oils she was piling on. Her scalp had weeks of buildup that her shampoo could not touch. I put her on Moroccanoil Clarifying Shampoo once a week to actually remove that buildup, then Aluram Moisturizing Shampoo for her regular washes. Within a week, she could feel the difference. Her hair actually felt clean for the first time in months.

Where Should Conditioner Actually Go?

Here is where most people mess up. Conditioner is not for your scalp. Your scalp makes its own oil. It does not need more moisture piled on top. Conditioner is for your mid lengths and ends where your hair is oldest and driest.

Marissa was slathering conditioner from root to tip because she figured more coverage meant more moisture. All it did was weigh down her roots and make her hair look greasy by noon. Once I showed her to apply Aluram Moisturizing Conditioner only from her ears down, her roots had volume again and her ends stayed soft without that heavy feeling.

Conditioner works by coating your hair in slippery stuff that smooths down those cuticle shingles I mentioned. That is why your hair detangles easier after conditioning. It also leaves behind ingredients that protect against heat and keep moisture locked in. But it only works on the parts of your hair that need it, which is not your scalp.

Do Hair Oils Actually Penetrate?

This is where it gets interesting. Not all oils work the same way. Some actually get inside your hair and strengthen it from within. Others just sit on top and add shine. Both are useful, but you need to know which is which so you do not overdo it.

Coconut oil is one of the few oils that can actually get inside the hair shaft because the molecules are small enough. That is why it is so good as a pre-shampoo treatment. You put it on, let it sit, and it strengthens your hair from the inside before you wash. Apira Coconut Oil Treatment is perfect for this.

Argan oil and jojoba oil have bigger molecules, so they mostly coat the outside. That is not bad, it just means they are finishing products for shine rather than treatments for strength. Moroccanoil Treatment is my go to for that glossy finish without the grease.

Marissa was using coconut oil, argan oil, AND a finishing oil. Every single day. Three oils doing overlapping jobs, none of them getting a chance to actually work because they were all fighting each other. I had her do coconut oil as a treatment once a week before shampooing, then just a tiny bit of Moroccanoil after styling for shine. She cut her oil use by two thirds and her hair looked ten times better.

When Should I Use a Serum?

Serums are finishers. That is it. They go on last to seal everything in and smooth down your cuticle so light bounces off and your hair looks shiny. If you put serum on first, you are basically putting a raincoat on your hair before trying to moisturize it. Nothing else can get in.

This was Marissa's biggest mistake. She was putting serum on damp hair before blow drying, then adding oil after. The serum sealed her cuticle shut, so the oil just sat on top looking greasy. We flipped her routine completely. Now she uses Moroccanoil All in One Leave in Conditioner on damp hair for moisture, blow dries, then finishes with Keune Keratin Smooth Serum as the final step. Her frizz disappeared because the serum was finally doing what it was supposed to do.

Can You Use Too Much of a Good Thing?

Absolutely. This is the mistake I see most often. People think if a little is good, more must be better. But with hair products, more usually means buildup, heaviness, and hair that looks worse instead of better.

Silicones build up. Heavy oils build up. Even good stuff like protein can be too much if you overdo it. Marissa's hair was simultaneously coated in product AND dehydrated underneath because nothing could get through all those layers. It felt heavy but looked dry, which makes no sense until you understand that she had basically waterproofed her hair with all that product.

After one good clarifying wash and a simplified routine, everything changed. Her hair could finally breathe. The products she used could actually absorb instead of sitting on top. She started getting compliments on her hair for the first time in years. I wrote more about this balance in my blog on Protein Overload In Hair and What it Means.

Your Product Questions Answered

Does the order I apply products really matter?

More than you would think. Thinnest to thickest is the general rule. Treatments and leave ins go on damp hair first. Heavier stuff like oils come next. Serums seal everything in at the end. Marissa had it completely backwards, which is why nothing worked.

My hair feels slippery but looks dry. What gives?

Classic buildup. Your hair is coated in silicones and oils that make it feel slick, but the actual strand underneath is dehydrated because nothing can get through. You need a good clarifying shampoo to hit reset, then start fresh with lighter products.

How often should I clarify?

Depends on how much product you use. If you are heavy handed with styling products, once a week. If you use minimal product, every two weeks is fine. Marissa was never clarifying, which is why months of buildup had accumulated.

Can I skip conditioner if I use oils?

Not really. They do different things. Conditioner smooths your cuticle and adds slip so you can detangle. Oils add shine and some can strengthen. You probably need both, just use each one correctly and do not go overboard.

Build a Routine That Actually Works

Marissa went from seven products to four. Her hair went from heavy and dull to light and shiny. She stopped wasting money on stuff that did the same thing and started spending it on products that actually worked for her hair type. That is what understanding your products does. It cuts through the marketing nonsense and gets you results.

If your current routine is not working, it might not be the products. It might be how you are using them, what order you are applying them, or whether you are using too many that do the same job. I see this every single day in my chair.

Book a consultation and bring your products. I will tell you which ones to keep, which ones to ditch, and how to actually use them so you get results instead of frustration. Follow me on Instagram @themanebri for more tips that actually make sense.

Book at The Warehouse Salon in Fairfield at 1275 Bloomfield Ave, Building 1, Unit 3 by calling 973-500-4536. If you're closer to Chatham, visit Studio 360 Salon and call 973-701-3030.

Stop guessing. Start understanding. Your hair will thank you.