CONDITIONER
How to use conditioner properly
The short answer
Conditioner coats the hair so strands slide past each other. Use it after every shampoo on mid-lengths and ends, not the roots. It smooths hair and cuts breakage. It does not repair damage.
See how it works
Do this
- 1Shampoo first, squeeze out the water, then apply conditioner.
- 2Cover mid-lengths and ends. Keep it off an oily scalp.
- 3Comb it through gently, ends first, while the conditioner is on.
- 4Leave it a minute or two, then rinse well.
- 5Dry or curly? Add a little leave-in on damp ends.
- 6Hair feels coated or limp? Use a clarifying (deep-cleaning) wash now and then.
The numbers behind it
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100% to under 10%
Chance of a damaging snag when combing wet bleached hair fell from 100% to under 10% with conditioner (lab hair bundles).
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Fewer breaks
A commercial conditioner reduced both short and long hair breaks during combing of bleached hair bundles (lab).
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Smooths, not repairs
In a lab test, conditioner ingredients cut combing force but did not undo bleach-type (oxidative) damage.
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Not absorbed
Expert safety panel: dimethicone (a common silicone) is not absorbed through skin and is safe in cosmetics as used (up to 15%).
For your hair
Curly, coily or bleached hair
Rougher, damaged hair snags more, so conditioner matters most. Use a richer one and detangle with it.
Fine or low-density hair
Use a light conditioner on the ends only. Heavy formulas can weigh hair down.
Oily scalp
Start the conditioner at ear level. Rinse thoroughly.
Myths to ignore
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Myth Conditioner repairs split ends and damage.
Truth It lubricates and smooths the surface. In the lab it improved combing but left the damaged structure unchanged. Only a trim removes a split end.
Tham 2026 ↗ -
Myth Silicones suffocate hair and should be avoided.
Truth Hair is dead tissue, so nothing suffocates. Silicones cut friction and add shine. Water-insoluble types can build up; an occasional clarifying (deep-cleaning) wash fixes it.
Carvalho 2025 ↗ -
Myth Silicone-free conditioners cannot work.
Truth On bleached hair, silicone-free emulsions partly or fully restored the water-repelling surface, similar to a silicone formula. Lab study by an ingredient supplier.
Liu 2022 ↗
Made for this
Go deeper
- How conditioner worksRinse-off conditioner coats hair with a positively charged layer that cuts friction and tangling; it does not repair structural damage.
- Silicones in hair careSilicones coat hair to cut friction and add shine without repairing it; buildup is real but manageable, and the scare claims are unsupported.
- Leave-ins, masks and layering methodsMasks and leave-ins use the same conditioning chemistry as rinse-off conditioner; layering methods like LOC rest on consumer satisfaction, not trials.
All studies in this guide (6)
New S et al. Measuring the frequency of consumer hair combing and magnitude of combing forces on individual hairs in a tress and the implications for product evaluation and claims substantiation. 2018
Result: Women combed about 16 strokes a day; wet bleached hair snagged every time and conditioner cut that to under 10%.
Read the study ↗Robbins C et al. Hair breakage during combing. III. The effects of bleaching and conditioning on short and long segment breakage by wet and dry combing of tresses. 2007
Result: Dry combing breaks the ends more per stroke; wet combing breaks hair higher up; conditioner reduced both short and long breaks.
Read the study ↗Tham HP et al. Electrokinetic analysis reveals common conditioner ingredient interactions with human hair. Int J Cosmet Sci. 2026
Tested: behentrimonium chloride and methosulfate, cetrimonium chloride, stearalkonium chloride
Result: Longer-chain behentrimonium chloride cut wet combing force and deposited best; none reversed oxidative damage.
Read the study ↗Nair B, Cosmetic Ingredient Review Expert Panel. Final report on the safety assessment of stearoxy dimethicone, dimethicone, methicone, amino bispropyl dimethicone, aminopropyl dimethicone, amodimethicone, and related silicones. Int J Toxicol. 2003
Result: The panel judged dimethicone and the amino-silicones safe as used in cosmetics, with minimal absorption.
Read the study ↗Carvalho RM, Melo DF, Kelati A, Tosti A. With or without silicones? A comprehensive review of their role in hair care. Skin Appendage Disord. 2025
Tested: silicones in hair care
Result: Silicones reduce friction, prevent moisture loss and add shine and heat protection, with build-up concerns for water-insoluble types; newer water-dispersible forms exist.
Read the study ↗Liu Z et al. Effects of cosmetic emulsions on the surface properties of Mongolian hair. ACS Omega. 2022
Result: Bleaching raised wettability and friction; emulsions containing conditioning agents restored water repellency and reduced combing work.
Read the study ↗