In my experience both seems to be pretty strong by itself. Idk if this is a viable source of Info but I came across this article about thin hair being stronger?

The researchers tied individual strands of hair to a machine that gradually pulled them apart until they broke. To their surprise, they found thin hair was able to endure greater tension before it broke compared to thick hair. This also applied to hairs from the same species. For example, thin hair from a child was stronger than thicker hair from an adult.

https://jacobsschool.ucsd.edu/news/release/2937?id=2937#:~:text=The%20researchers%20tied%20individual%20strands,hairs%20from%20the%20same%20species.

I read either one of two things: Kinky/afro hair are either more prone to breaking and loss (as I read that 1 in 3 black women/men experience TA), or that afro textured hair can sustain damage more as to why it can be put into tight braids. Being why I see comments on (mostly) white peoples post about how they will experience TA (loss) because they chose to do box braids.

So which is it? Is it misinformation?

Does anyone know the science behind the Loreal Dream Lengths Sleek Straightening shampoo? Is it proven to help strengthen hair or is it just a marketing scam?

this is the product: https://skalabrasil.com/produto/-mais-cachos-59

i'm a hairstylist but i don't know much about chemistry, etc. i found Skala last summer, specifically the blue tub, and I like it. it's cheap, has decent hold, seems moisturizing.

my hair is curly (like type 3) if that matters and i use this product to define my hair. i really care about finding good products and a routine so i can do it every wash day and not feel like i'm doing anything that could accelerate damage. i don't even flat iron my hair even occasionally. the most damaging thing i do to my hair on purpose is use a warm hooded drier. i've seen some people on tiktok say that "skala is bad for your hair" and "brazilians don't even use it because it has a bad name in brazil" but this is coming from random tiktokers who aren't knowledgeable in this subject.

so for the people out there who know about cosmetic chemistry, do you think this product is good to use long term. i've been usually using it as the only thing i leave in after washing so there's usually nothing else "protecting" or moisturizing my hair.

ingredients: Aqua, Cetearyl Alcohol, Cetrimonium Chloride, Stearamidopropyl Dimethylamine, Shea Butter Cetyl Esters, Parfum, Glycerin, Ricinus Communis (Castor) Seed Oil, Methylchloroisothiazolinone (and) Methylisothiazolinone, Argania Spinosa Kernel Oil, Citric Acid, Tocopheryl Acetate, Panthenol, Coumarin, Linalool.

i was wondering if there is a specific heat protectant spray that really helps prevent split ends, especially when straightening hair. ive been seeing people spray heat protectant on a receipt paper, let it dry and then use a straightener on it. but is that the real way to tell if a heat protectant would fully protect hair and can i trust these videos?

So we know ionic hairdryers do produce negative ions (using a ceramic or even tourmaline plate or needle.) But do any of you actually believe in the claims that they "reduce frizz," "repair hair" and "improve lustre." The main claim is that they dry hair faster but some studies actually show anions INCREASE the surface tension of water.

In other words, is there any general principle of how to alternate them with "regular" conditioners for maximum efficacy?

Because a lot of the reviews for this type of liquid conditioner (aka "wonder" or "miracle" hair water) seem to call out the same two things: "love the convenience" and "hair feels more brittle after a few uses, confused why".

Hello r/haircarescience! Welcome to our weekly megathread for haircare advice.

This is your place to freely ask for personal advice on styling, coloring, product recommendations or any other burning questions you may have about hair care that may not warrant its own thread due to the rules currently in place.

Medical advice and questions are still prohibited along with spamming and advertising.

Please make sure that you include this information when asking a question. This will be enforced.

• Hair type: (fine, coarse, thick, thin)
• Hair texture: Straight/wavy/curly/coiled
• History of chemical processing: (Coloring/straightening/perms/use of heat styling)
• Hygiene regimen: (daily, twice weekly, once weekly shampoo and conditioning)
• Style: (Blunt cut/layered/bob or waist length)
• Product regimen: (State products, whether you are actively avoiding sulfates or silicones or following any particular regimen)

The normal "source your facts" rule do not apply here as individual professional opinion mostly comes from personal taste or anecdotal evidence. We simply ask that you don't state your advice as fact. The opinion of one individual may not represent the opinion of a profession as a whole. Hairdressers this is your time to shine!

Any posts asking for personal advice that are made throughout the week will be redirected here. This post will remain stickied until the end of the week.

We hope you enjoy this format and if you have any feedback please let the mod team know!

Hello, I was just curious. When I was a kid (0-10) I had very ginger and curly hair but then it's turn a auburny brown and flips between straight and wavy hair. What's the science behind this?

Hello all! I have a hypothetical I was looking to get answers for.

I have an character made set years into the zombie apocalypse, and I want her to have this special yet hard-to-achieve hobby of dye-ing her hair even years into the apocalypse. However this makes me wonder,

How long can hair dye REALLY last? A Google search suggests 3 years, but in this scenario could she get away with more? 5 years? 7 years? 10 years? Even more?

What would be the consequences on her hair of using hair dye after that long? Would bleach also survive that long? What brands would reasonably be best for something like this? Or perhaps easier to answer, which would be the worst? Would certain colors be better after such a long time?

In the event these are obsolete, are there any natural remedies? Something to bleach the hair and then dye it a certain color?

Even if there's no solid proof for any definitive answer, simple speculation/guess work is also appreciated!

Tdlr; Can hair dye and hair bleach survive 10 years untouched and still be used?

I cant seem to find a clear answer on this and have seen opposing claims. Citric acid rinse after keratin treatment- will it help maintain smoothness? Will it shorten the duration of the treatment? Will it make no difference? Would love it if someone could explain the interaction or point me to definitive research (if there is any)

So, I’m a “afro haired “ girl and I’ve been researching the best ways to take care of our hair type, which has had to little research done on it and is plagued by too much personal opinion and misunderstanding online as a result. Throughout my research I have learned:

Afro hair is the most fragile and dry Afro hair has the thickest external lipid layer Afro hair has a sparse outer cuticle, it is naturally higher in porosity than other hair types Black people have the most sebum production, we just aren’t aware of it because it doesn’t travel down our hair strands Black people have the highest chance of getting seborrheic dermatitis. A lot of black hair care focuses on “hydrating”, what they actually mean by hydrating isn’t actually water but conditioning. Combing and Braiding causes the most mechanical damage on afro hair, best to detangle when wet.

So I’ve come up with a few modifications to the traditional black hair care routine to optimize my hair health:

Washing 2-3x a week to keep my scalp clean. Choosing a shampoo and conditioner with silicones because they’re wonderful conditioning agents with a myriad of benefits. Oiling my ends with a silicone based serum to provide lubrication and reduce frizz Silk pillowcases, bonnets and scarves Detangling with a brush only once a week! Finger detangling only on the other wash days Focusing on providing a lot of conditioning - opting for curl creams over gels, thick leave ins etc Getting consistent trims.

(Please let me know if there’s any potential good practices I’m overlooking!)

However, something I have not figured out is preventing single strand knots on this hair type!! Single strand knots are length retentions final boss because they cause breakage, and have to be chopped off eventually. Wearing your hair straightened/ stretched seems to be the best current way. And being a straight natural (a person with natural hair who straightens their hair with heat tools) is currently trending, with good results when it comes to retaining length (less tangling, less knots = less breakage)

I have two questions:

Can anyone point me to scientific literature that talks about knots in natural hair , or what could be done. Or based on yalls research, what are some theories you have that I could try/look in to. I’m a big believer in self-experimentation when done safely. I believe we shouldn’t have to wear our hair straightened to grow it in the most ideal way.

Another question I have: If natural hair is naturally more fragile and natural hair is naturally higher in porosity: would virgin natural hair benefit in theory from bond building products too? Should black hair care not only focus on “hydration” but bond building and strengthening as well? How could this be incorporated into one’s routine.

Does anyone know anything about the effects of the Corona Virus on hair texture, thickness, or shape?

As the subject says, Kerastase touts that all of their products are "color-safe." However, almost all of their shampoos have sodium laureth sulfate as the second ingredient. Everything I've read and have heard from stylists over the years is that sulfate will strip the color out of bleached/color-treated hair. I've also seen several reviews on the Kerastase site where people say the product made their hair color fade. Is there something magical that Kerastase does that makes their products safe for color-treated hair, even if it has SLS, or is that just a baseless marketing claim?

Curious about the science behind it

Im a hairdresser and we use sillicones much in the salon as it strengtens and protects te hair shaft and makes it look silky smooth and feel soft. But i really want to know how much moisturizing ingredients like oils, fatty alcohols and extract can penetrate really into the hair because sillicones are creating a film around your hair so nothing can come in our out. Personally i like to use a sillicone free leave in and them putting a leave in with sillicones to make sure the hair gets enough moisture but is would this be nessecery ? (Not asking for advice just curious about product formulation i know how to take care of my own hair!)

Hello r/haircarescience! Welcome to our weekly megathread for haircare advice.

This is your place to freely ask for personal advice on styling, coloring, product recommendations or any other burning questions you may have about hair care that may not warrant its own thread due to the rules currently in place.

Medical advice and questions are still prohibited along with spamming and advertising.

Please make sure that you include this information when asking a question. This will be enforced.

• Hair type: (fine, coarse, thick, thin)
• Hair texture: Straight/wavy/curly/coiled
• History of chemical processing: (Coloring/straightening/perms/use of heat styling)
• Hygiene regimen: (daily, twice weekly, once weekly shampoo and conditioning)
• Style: (Blunt cut/layered/bob or waist length)
• Product regimen: (State products, whether you are actively avoiding sulfates or silicones or following any particular regimen)

The normal "source your facts" rule do not apply here as individual professional opinion mostly comes from personal taste or anecdotal evidence. We simply ask that you don't state your advice as fact. The opinion of one individual may not represent the opinion of a profession as a whole. Hairdressers this is your time to shine!

Any posts asking for personal advice that are made throughout the week will be redirected here. This post will remain stickied until the end of the week.

We hope you enjoy this format and if you have any feedback please let the mod team know!

Why is it hard to balance effectiveness, use, and hair/scalp health and safety?

Most of the products right now are still:

- damaging to hair and hair scalp health. This is most noticeable with men's scalp. If you start using color for your grays, in a few years, you'll notice balding and/or hair fall as their harsh chemicals damage the scalp

- messy to use, there are sprays that's not as harsh to scalp and hair, but they last only a few wash

- not much of a good option for "camo" to make coloring of grays more natural. There's a few like Redken, but the damage that does to your hair and scalp is scary.

Curious about these acidic bonding lines and specifically Redkin. They offer multiple products and it’s unclear how they are supposed to be used in concert with each other.

from a hair science perspective, what is the difference between air drying, rough drying, using a diffuser, using a blow dry brush, or doing a blowout with a hair dryer and separate brush? are any of these options less damaging than the others?

is there actually a way to get hair from wet to dry that is proven to be healthier for the hair?

do the type of bristles on the brush or blowout brush truly make a difference?

I saw a post on another thread/subreddit claiming that an individual's hair length was genetically determined. That, if a person took care of their hair perfectly, their own individual hair would max out at a certain length and fall out at that point.

I'm just curious if that is pseudoscience or true.

Either multiple parts of the strand OR split in the middle with the ends intact? The hair strands are usually very thick too.

What started as a comment someone left on r/curlyhaircare about hair typing being "fake" and "useless marketing hype" has somehow spiraled into me reading every paper on the subject of hair typing.

One of the most interesting researchers is Dr. Tina Lasisi, a biological anthropologist who is an Assistant Professor at University of Michigan. This is especially interesting for me since I briefly studied biological anthropology, and also her research involves working with Python, a programming language I know.

Her thesis was on the evolution of hair, specifically hair and thermal regulation and the theory that tightly coiled hair helps cool the human brain. It's pretty readable and available for free online. She also addresses the role of racism in hair typing and discrimination.

Also her papers expanding on this theory

Human scalp hair as a thermoregulatory adaptation

And the paper I read the closest which is partially about hair typing
High-throughput phenotyping methods for quantifying hair fiber morphology

Both are open access!

Does it then make sense to have hair typing systems that devote half their types to less curly hair? Probably depends on the implications for hair care which is another subject.

Have you read these papers? What did you think?

What does high alkalinity and pH do to hair? With soft water?

Thanks!

Hello r/haircarescience! Welcome to our weekly megathread for haircare advice.

This is your place to freely ask for personal advice on styling, coloring, product recommendations or any other burning questions you may have about hair care that may not warrant its own thread due to the rules currently in place.

Medical advice and questions are still prohibited along with spamming and advertising.

Please make sure that you include this information when asking a question. This will be enforced.

• Hair type: (fine, coarse, thick, thin)
• Hair texture: Straight/wavy/curly/coiled
• History of chemical processing: (Coloring/straightening/perms/use of heat styling)
• Hygiene regimen: (daily, twice weekly, once weekly shampoo and conditioning)
• Style: (Blunt cut/layered/bob or waist length)
• Product regimen: (State products, whether you are actively avoiding sulfates or silicones or following any particular regimen)

The normal "source your facts" rule do not apply here as individual professional opinion mostly comes from personal taste or anecdotal evidence. We simply ask that you don't state your advice as fact. The opinion of one individual may not represent the opinion of a profession as a whole. Hairdressers this is your time to shine!

Any posts asking for personal advice that are made throughout the week will be redirected here. This post will remain stickied until the end of the week.

We hope you enjoy this format and if you have any feedback please let the mod team know!