INGREDIENTS / HAIR CARE
Silicones spent years on the curly-hair blacklist. But they can also make hair smoother, shinier and easier to detangle. So were we avoiding the wrong thing?
Silicones have had an interesting career in curly hair.
For decades, they were quietly making conditioners feel silky.
Then the ingredient-list era arrived and suddenly dimethicone became something you were supposed to spot, circle and put back on the shelf.
The concern wasn’t completely invented. Some silicones can accumulate on hair if your cleansing routine doesn’t remove what you’re depositing.
But somewhere between “this ingredient can build up” and “silicones are bad for curls,” we skipped a lot of important information.
Because silicones can also do something curly hair tends to appreciate very much:
reduce friction.
Silicones are conditioners, not plastic wrap for your hair
The basic job of a silicone in hair care is usually to change the surface of the hair fibre.
Ingredients such as dimethicone and amodimethicone can deposit along the hair, creating a smoother surface with less friction between strands.
That can translate into easier combing, more slip, less roughness and more shine.
And for curls—which naturally bend, twist and make frequent contact with neighbouring fibres—that reduction in friction can be useful.
Research comparing treated hair fibres has found that silicones can significantly change fibre-to-fibre friction, combing behaviour, manageability and even how a mass of curly hair behaves in humidity.
They don’t permanently repair a damaged strand or turn it back into virgin hair.
They can make the damaged surface considerably easier to live with.
A coating on the hair is not automatically a bad thing. Sometimes the coating is the reason your comb made it through.
Where did the fear come from?
Buildup.
And this part deserves more than an eye roll, because buildup can happen.
Some silicones are not readily soluble in water. If you repeatedly use products that deposit them while relying exclusively on very mild cleansing—or co-washing without shampoo—the residue can accumulate.
Hair may start feeling heavy, coated or dull. Fine curls may lose volume. Your usual stylers may stop behaving the way you expect.
That is a cleansing problem.
It is not proof that silicone has suffocated your hair.
Hair fibres are not breathing organs. What you are dealing with is material deposited on the surface that may eventually need to be washed away.
A dermatology review on co-washing documented exactly this issue: combining repeated use of water-insoluble silicone products with cleansing methods that remove very little residue can lead to significant buildup.
The fix is considerably less dramatic than a permanent silicone ban.
Wash your hair.
And if your normal shampoo is no longer removing enough residue, use a more thorough cleanser when needed.
Your curls suddenly feel coated even after washing.
Products that normally work seem to sit on top of the hair.
Your hair looks dull or unusually limp.
You use rich leave-ins, oils or silicone stylers but mostly co-wash.
Before replacing your entire routine, try cleansing it properly.
Not every silicone behaves the same way
This is where a lot of silicone advice starts falling apart.
“Silicones” are not one ingredient.
They’re a large family of materials that can differ in molecular size, charge, volatility, solubility and how strongly they deposit onto hair.
Dimethicone is one of the most familiar. It creates a smooth, hydrophobic film and is widely used for slip, shine and surface protection.
Amodimethicone contains amino groups, giving it different deposition behaviour from ordinary dimethicone. Hair-care formulators use functionalized silicones like these to fine-tune how a conditioner interacts with the fibre.
Dimethiconol is another conditioning silicone that can appear in serums, conditioners and smoothing products.
Then there are volatile silicones and silicone derivatives designed to behave differently again.
So an ingredient rule that begins with “anything ending in -cone…” is already trying to turn a fairly complicated branch of cosmetic chemistry into a scavenger hunt.
Damaged hair may have more reason to like them
Bleaching, colouring, chemical processing, heat and everyday weathering can roughen the hair surface and increase friction.
That is precisely the kind of surface silicones are good at temporarily smoothing.
Research on cosmetically damaged hair shows that conditioning treatments can restore some of the hydrophobic behaviour and softness lost when the outer surface is damaged.
Other work on chemically straightened Afro-textured hair found that conditioning ingredients—including a silicone-based treatment—improved measures related to protein loss, combability and breakage resistance.
That doesn’t mean damaged curls need silicone.
Silicone-free formulas can also condition hair very effectively. Modern conditioners have plenty of other tools: cationic conditioning agents, fatty alcohols, oils, esters and polymers among them.
It means removing silicones simply because your hair is curly may also mean removing an ingredient your damaged ends happen to enjoy.
The real question is whether your routine can handle them
Imagine two people use the same silicone serum.
One shampoos regularly, has bleached ends, loves a polished finish and uses two drops before diffusing.
The other has very fine curls, uses a generous amount every day and cleanses almost exclusively with conditioner.
Their reviews of that serum could be completely opposite.
Both could be right.
The silicone did not change personalities between bathrooms. The routines around it did.
If your curls are easily weighed down, start with a tiny amount and pay attention to where you apply it. The ends may love something your roots absolutely do not need.
If you mostly co-wash, be more aware of the products you’re repeatedly depositing and occasionally check whether your hair needs a proper shampoo.
If you regularly colour, bleach, diffuse or detangle hair that feels rough, a silicone-containing conditioner or serum may be exactly the kind of surface lubrication you want.
And if your silicone-free routine already gives you great hair?
There is no reason to add one just to prove a point.
You also don’t need to fear them for safety reasons
The curly-hair argument around silicone is primarily about cosmetic performance and buildup, not evidence that commonly used cosmetic silicones are inherently unsafe.
The Cosmetic Ingredient Review Expert Panel has evaluated dimethicone, methicone and related silicone polymers used in cosmetics and concluded that the assessed ingredients are safe under their established conditions of cosmetic use when formulated appropriately.
That doesn’t mean every product will agree with every person.
Any cosmetic can be a bad match for a particular scalp, and anyone with irritation, allergy or persistent scalp symptoms should treat that as a separate issue.
But my curls feel weighed down by this serum and this ingredient is dangerous are two very different conversations.
How I’d shop for silicone now
I wouldn’t shop for it at all.
I’d shop for the result.
If you want more slip in your conditioner, look for a formula that gives you more slip.
If you want a serum that smooths flyaways and adds shine, try one and see whether it does that without flattening your hair.
If your ends tangle constantly, pay attention to which conditioners make detangling easier.
Then turn the bottle around and start noticing patterns.
You may discover that the products your hair loves contain amodimethicone.
Or that every dimethicone-heavy serum you try leaves your fine curls flat.
That is useful information because it belongs to your hair.
Much more useful than deciding an entire category of ingredients is forbidden before you ever try it.
It gives you better slip.
Your curls feel smoother without becoming heavy.
Detangling is easier.
You like the shine and finish.
Your normal cleansing routine keeps buildup under control.
If it works, the ingredient-list internet does not get a veto.
Curly-hair care became more useful when we started paying attention to what textured hair actually needs.
It becomes less useful when those observations turn into permanent ingredient commandments.
Silicones can build up. They can also smooth rough fibres, reduce friction, add shine and make detangling easier.
Your job is not to decide whether silicones are good or bad. It’s to decide whether you like what they do to your hair.
Disclaimer: This article provides general hair-care information and is not a substitute for advice from a dermatologist or other qualified healthcare professional. Persistent breakage, scalp changes or sudden hair loss should be evaluated by a healthcare professional.