Beauty
“I shared a video showing my severely damaged hair last week and saw tons of comments like this one saying that my hair wasn't even damaged. Long hair can sometimes be deceiving, so I totally get it! Here are the signs of damage that I wish I was aware of sooner, so that I could have done more to prevent my hair to getting to this point.…”
Plain restatementHair can carry structural damage that is not obvious to a viewer, particularly on long hair; there are recognisable signs of that damage; bleaching, colouring, heat styling and sun exposure cause it; reducing bleaching frequency produced most of the improvement described; and a hair care routine contributes to maintaining the condition of hair as it grows.
General information only - not medical or dermatological advice.
This post is mostly accurate. The science behind it holds up: bleaching, hair dye, heat styling and sun exposure all break down the proteins and the protective outer layer of the hair strand, and because hair above the scalp is not living tissue, that damage stays in the hair until it is cut off. It is also true that damaged hair can look fine to someone scrolling past, so people disagreeing in the comments about whether hair "looks" damaged are judging something the eye cannot reliably assess. The one point that goes further than the evidence is calling a care routine "crucial". Testing on hair care products is mostly done on cut hair in a laboratory, measuring things like how easily strands comb or snap, and there are no trials showing what a full routine does for a person over time. Much of that testing is also funded by or connected to the industry that sells the products. The post itself says the biggest factor was cutting back on bleaching, and that part matches what dermatology guidance says, which is to space out chemical processing and limit how far hair is lightened. This is general information only and not medical or dermatological advice.
[drifted from the evidence:] I shared a video showing my severely damaged hair [drifted from the evidence:] last week and saw tons of comments like this one saying that [drifted from the evidence:] my hair wasn't even damaged. Long hair [drifted from the evidence:] can sometimes be deceiving, so I totally get it! Here are [drifted from the evidence:] the signs of [drifted from the evidence:] damage that [drifted from the evidence:] I wish I was aware of sooner, so that I could have done more to prevent my hair to getting to this point. Also, this video isn't meant to suggest that my hair went from that severely damaged state to where it [drifted from the evidence:] is now *only* because of [drifted from the evidence:] my routine. I obviously have significantly reduced the [drifted from the evidence:] amount of bleach I get since then, which makes a big difference! But as someone who knows what it's like to have severe damage, and [drifted from the evidence:] still regularly damages their hair [drifted from the evidence:] with bleach, coloring, heat & UV, my routine [drifted from the evidence:] still plays a crucial role in maintaining the [drifted from the evidence:] health of [drifted from the evidence:] my hair as it grows!
Hair [added by the neutral restatement:] can carry structural damage that [added by the neutral restatement:] is not obvious to a viewer, particularly on long hair; [added by the neutral restatement:] there are [added by the neutral restatement:] recognisable signs of that [added by the neutral restatement:] damage; bleaching, colouring, heat styling and sun exposure cause it; [added by the neutral restatement:] reducing bleaching frequency produced most of the [added by the neutral restatement:] improvement described; and [added by the neutral restatement:] a hair [added by the neutral restatement:] care routine [added by the neutral restatement:] contributes to maintaining the [added by the neutral restatement:] condition of hair as it grows.
Red-tinted words in the claim drifted from the evidence. Green-tinted words are what a neutral restatement needs.
The trace / claim to source
- Bleaching breaks disulfide bonds in hair keratin and converts them to cysteic acid, which weakens the fibre. This is reported in the peer-reviewed literature as the core chemistry of bleach damage.
- Alkaline bleaching can also remove the 18-MEA lipid layer from the cuticle surface, which makes hair more water-attracting and rougher to handle.
- Colouring and bleaching are described in the literature as accelerating cuticle breakdown across the full length of the fibre, so damage is not limited to visible split tips.
- UV exposure causes a similar oxidation of cystine to cysteic acid along with lipid and tryptophan degradation, so listing UV alongside bleach, colour and heat as a damaging exposure matches the published work.
- Hair below the scalp is non-living and has no repair machinery, so damage to a given length is permanent for that length while new growth is unaffected. This supports the post's framing that a routine helps maintain condition "as it grows".
- The post's statement that reducing bleaching made a big difference is consistent with professional guidance. The AAD describes colouring and perming as treatments that can leave hair dry and brittle and advises limiting how far hair is lifted from its natural shade, because bigger lifts require stronger peroxide.
- The post's point that damage can be hard to see is consistent with the physiology: condition at the surface and structural integrity inside the fibre are separate things, and hair can feel smooth while still being weakened.
- The caption explicitly declines to attribute the improvement to the routine alone and names reduced bleaching as a major factor. That is a qualifier the post supplies itself, and it matches where the evidence puts the larger lever.
- "My routine still plays a crucial role" is stronger than the available evidence can support for any routine. What has been measured is the performance of individual conditioning and repair products on bleached or UV-exposed hair tresses in a laboratory, in percentage changes to combing force or tensile strength. There is no trial of a whole routine in people, and no way to establish how much of one person's outcome came from products rather than from reduced bleaching, trimming and new growth.
- Laboratory fibre results are not clinical results. A finding that treated tresses held tensile strength after UV while untreated tresses lost around 14 percent describes cut hair in a controlled test, and should not be read as a measured benefit on a person's head.
- The post implies the routine is maintaining hair that is still being bleached, coloured, heat styled and sun exposed. Products can reduce breakage and improve handling, but they do not stop the underlying oxidative damage from those exposures accumulating, and they cannot rejoin a split end.
- The before and after framing of a "severely damaged state" versus "where it is now" invites a product explanation even though the caption denies one. Length cut off, hair grown since, and reduced bleaching all change what is visible, independently of any product.
- The condition of the poster's hair, past or present, cannot be verified. Personal before and after accounts are not evidence of effect under the standards used here.
- No routine, product or ingredient is named in the caption, so nothing specific could be graded for efficacy.
- The literature does not agree on how much each waveband of sunlight contributes to hair damage; the 2015 short review states there is no consensus on the specific effects of UV, visible and infrared ranges.
- The widely repeated recommendation to leave 8 to 10 weeks between chemical processing sessions is attributed to the AAD by secondary sources. I could not confirm that exact figure in retrieved AAD text, so treat the number as unconfirmed while the general advice to space processing is supported.
- Funding and conflict of interest for several of the ex-vivo repair-product studies is not fully disclosed in what was retrieved, and much of this field is industry-funded without independent replication.
The peer-reviewed literature supports the mechanism the post describes. Bleaching oxidises the disulfide bonds of cystine in hair keratin to cysteic acid, which reduces the structural rigidity of the fibre, and alkaline bleaching also strips the 18-methyl eicosanoic acid layer that makes the cuticle surface water-repellent, leaving hair more hydrophilic and rougher. Bleaching and colouring accelerate cuticle degeneration along the whole length of the fibre, not only at the tips. Solar radiation produces a comparable chemistry: UV exposure oxidises cystine to cysteic acid, degrades tryptophan and surface lipids, and alters colour and mechanical properties, with UVB associated mainly with protein loss and UVA with colour change. The 2015 short review notes there is no consensus in the literature on the precise contribution of each waveband. The hair shaft above the scalp is non-living keratin with no biological repair mechanism, so structural damage accumulates and cannot be reversed by the fibre itself. This is the basis for two things in the post being compatible: hair can look acceptable to a viewer while being structurally compromised, and new growth emerges unaffected by damage done to older lengths. Conditioning and so-called bond or repair products are measured in ex-vivo tress testing for effects on combing force, breakage, surface smoothness and tensile properties. The 2024 Cosmetics paper uses bleached tresses specifically as a standard template because commercial "repair" products need a damaged substrate to show measurable differences. A hydrolysed keratin study reported that treated fibres retained tensile strength after UV exposure while untreated fibres lost about 14 percent, which is a laboratory fibre measurement, not a clinical outcome in people. Trade and brand sources state that split ends cannot be permanently rejoined and that only cutting removes them; that specific point is consistent with the non-living-fibre physiology in the peer-reviewed material but the sources asserting it most directly here are company pages. The AAD's own guidance frames colouring and perming as treatments that can leave hair dry and brittle and advises staying within about three shades of natural colour, because larger lifts need higher peroxide concentrations. A widely repeated "8 to 10 weeks between chemical processing sessions" figure is attributed to the AAD by several secondary sources; I did not retrieve that figure from an AAD page directly.
Complete reasoning
The reply is formatted for pasting into the thread where the claim is circulating.
Ask this case
Answers come only from the case file above; nothing is added.
Was the hair actually damaged even though some viewers said it looked fine?
Yes. The science supports this. Bleaching and other treatments cause structural damage inside the hair fiber that is not always visible from the outside, so hair can look acceptable while still being weakened.
Did cutting back on bleaching really make the biggest difference?
That claim matches professional guidance. Dermatology sources describe colouring and perming as treatments that can leave hair dry and brittle, and advise limiting how far hair is lightened, which lines up with the post's own statement that reduced bleaching was the major factor.
Is it true that a hair care routine plays a crucial role in maintaining hair health?
This goes further than the evidence can support. Testing on hair products is mostly done on cut hair in a lab, measuring things like combing force or breakage, not on how a full routine performs on a living person over time.
Can hair care products actually repair split ends or reverse damage?
No. Hair above the scalp is not living tissue and has no way to repair itself, so damage in a given length is permanent until it is cut off. Products can improve handling and surface smoothness but cannot rejoin a split end or undo the underlying damage.
How much of the improvement in the video came from products versus other factors?
The case file does not establish this. There is no trial separating how much came from products, how much came from cutting damaged length off, how much came from new growth, and how much came from reduced bleaching.