How to Repair Damaged Hair From Heat, Processing, And More

When selecting the perfect of-the-moment style for you (A rockabilly mullet, perhaps? A blunt bob? A mermaid-worthy mane?), a universal truth guides us all: damaged hair is a bummer. Even the coolest cut and color lacks the impact of well-tended lengths. But not to fear; how to repair damaged hair is easy once you identify what’s causing it in the first place.

Shab Caspara , New York City-based trichologist and founder of hair-care platform Leona , says that a poor hair care regimen can lead to weaker, frizzier, and more brittle strands over time. “The common causes of hair damage include mechanical damage (brushing, hair ties, extensions, and overall friction), chemical damage (overly bleached or processed hair), and thermal damage (flat and curling irons),” she details. But the culprits aren't limited to styling alone.



“The causes of hair fiber damage often have internal causes layered with the mechanical external causes,” explains New York City trichologist Bridgette Hill , citing prescription medicine intake, diet, vitamin and mineral deficiencies, age, hormones, products, and styling habits as causes of damage. For her part, Hill takes issue with the word “health” as applied to hair. “Healthy hair is an oxymoron,” says Hill.

“Hair is not a living cell or organ, and therefore has no true health quotient. Hair strands are literal protein threads, once they protrude out of the hair follicle, it becomes a fine fabric.” From this perspective, hair should be treated with care, handled as one would a delicate textile.

Still, Hill concedes that hair in its uncompromised, well-maintained state should have a proper balance of hydration and elasticity, body, and movement, and should respond to the products designed for that hair fiber type and texture. While you can’t heal a compromised hair fiber, you can take measures to prevent damage from occurring in the first place. “The goal is to first prevent further damage by adjusting the hairstyling habits that created the problem and implementing practices that promote hair health and nourishment to the hair fiber,” says Hill.

A weekly deep treatment routine consisting of nourishing ingredients like fatty acids, silk proteins, conditioning oils, and humectants will help your cause, too, as will a check-in with your doctor to determine if any preexisting conditions could be impacting your hair health. Let's start by identifying the damage. Here, we break down three common causes of damaged hair, how to mitigate the harm, and reparative steps to take to make your lengths as healthy as possible.

How to Tell Your Hair Is Damaged According to Neera Nathan , MD, board-certified dermatologist and chief dermatological advisor at Vegamour, hair damage shows up in three main ways: breakage, hair loss, and dryness. Breakage is when there is damage to the hair shaft that causes it to weaken and snap off. Hair loss is self-explanatory and dryness is caused by damage to the outer layer of the cuticle and results in moisture loss and coarse, dull hair.

Hair damage can vary based on hair type or texture. Nathan says breakage, for example, is more obvious in curlier hair because broken strands may stick out more. While hair loss might be more obvious in those with thinner hair.

Keeping that in mind as well as the causes of the damage will help you figure out to best treat it. 1. Mechanical Damage Mechanical damage is caused by hair wear-and-tear.

Dragging combs and brushes through your lengths, tying styles with taut ties and ribbons, and even exposing hair to the elements all take their toll over time. All of these externals can lead to the breakage of individual strands, weathering (and even eradicating) protective cuticles and any potential for lustrousness and leading instead to a frazzled and frizzy mane. While certain products exist to address damage caused by chemicals (read on for more) our experts insist that you cannot restore split ends or breakage in severely damaged hair.

The solution here is a trim or perhaps a full-on chop, the better to part ways with split ends before the breakage travels upward. To minimize the signs of mechanical damage, take a break from even the most basic of tools and embrace your natural texture with the help of products like Vernon François Nourishing Water or Ceremonia's Guava Beach Waves . Additionally, oils like JVN Complete Nourishing Hair Oil Shine Drops and No Frizz Vanishing Oil from Living Proof can quell frizz and ramp up radiance as your hair starts to heal.

“Wet hair is very fragile; handle with care,” says celebrity hairstylist Bridget Brager , who urges the use of a wide-tooth comb or wet brush. Her advice is to work from the ends of the hair up and let the hair air dry as much as possible before styling. This same kind of hair is necessary when you’re blowdrying.

“Choose a boar bristle brush or one that has a mix of plastic and boar’s hair bristles,” says Hill. “The idea is to stay away from metal brushes, which can abrasive to hair fiber and scalps.” Try Christophe Robin Special Blow Dry Hair Brush or Crown Affair's The Brush No.

001 for safer styling. Another way to extend your style? Protect it while you sleep with satin or silk pillowcases , scarves, and bonnets . “Create a signature sleep style that allows oxygen to flow through the hair to the scalp, to prevent tangling and matting in the occipital point of the head while you sleep,” explains Hill, citing twists, pin curls, large braids, or the pineapple method as excellent sleep styles.

2. Chemical Damage Fans of hair color and retexturizing treatments, take note: chemical damage is an insidious sort. While occasional chemical processing—accompanied by a strategic and regimented hair care routine—is no cause for concern, treatments that are too frequent, too harsh, or not accompanied by proper tending can lead to progressive deterioration of hair cuticles .

Take dyeing your hair. Nathan explains that some hair dyes can cause irritation or allergy on the scalp, which can lead to hair loss. They can also disrupt the hair shaft, which can lead to dryness and breakage.

“This is an unpopular opinion, but I often advise against hair dyes in most cases,” she says. Other chemical treatments, such as perms, can also cause damage to your scalp and strands. Some perms like Brazilian blowouts contain formaldehyde, which Nathan says can cause inflammation or an allergic reaction.

Some studies have also linked the harsh ingredient to cancer. TLDR: Bleaching may make hair appear plump , and retexturing may make daily styling easier, but chemicals do significant damage to protein structures over time. Bond-building hair products have been all the rage in recent years, and for good reason.

“You can improve the quality of hair after slight chemical damage using bond-building products that will rebuild the amino acid bonds that make up the keratin in hair, however, you cannot restore split ends or breakage in severely damaged hair,” details Caspara. Options like Olaplex No. 7 Bonding Oil or K18 Biomimetic Hairscience Leave-In Molecular Repair Hair Mask are two of the market's most talked about formulas, but Living Proof Triple Bond Complex and Bumble and bumble Bond-Building Repair Treatment both promise to strengthen hair and resist future damage, too.

Nathan adds that peptide hair treatments, like the Vegamour HYDR-8 Deep Moisture Repair Mask , can also protect and strengthen the hair shaft while also replenishing lost moisture. If you notice an allergic reaction, she says to seek care from a board-certified dermatologist. Though bond-building products help hair, regular maintenance is ultimate step toward prevention.

“The only way to rectify severe thermal or chemical damage is to frequently trim off dead ends and allow for healthier hair to grow down without being affected by lingering damage,” says Caspara. Brager agrees that regular trims can reduce split ends from fraying and breaking off, allowing you (and your hair!) to avoid more dramatic damage. 3.

Heat Damage Though heat tools may help our hair appear perfect, relying on them too frequently can do lasting harm to lengths. As with chemical processing, the repeated application of heat erodes the cuticle and weathers strands, leading to breakage over time. Too-high heat can even cause immediate damage, literally singing the very strands you're trying to style.

While there's no way to undo heat damage entirely, regular trims and an overhaul of your daily products can help. Take stock of your shampoo and conditioner to ensure both are free of harsh sulfates. “Never skimp on shampoo and conditioner, the thing you use the most!” says Brager, who agrees that sulfate-free products are the way to go.

While those looking to promote hair growth might reach for Vegamour’s duo powered by vegan silk proteins, those experiencing increased dryness should consider these picks by Briogeo and Alterna to restore softness, shine, and moisture. “Thermal protectants work wonders protecting hair from thermal damage as they provide a coating that won’t allow hair to burn so easily from excessive heat,” Caspara explains, though the first rule of thumb is to air dry or power dry with your fingers to get most of the moisture out before reaching for hot tools. Try a misting of Oribe Invisible Defense Universal Protection Spray or Mizani Heat Screen Heat Protectant Spray for a instant thermal shield.

Even when using heat protectants, Brager recommends lowering the temperature of your hot tools altogether. Though Dyson’s beloved blow dryer is designed to protect hair from damage despite its fast drying times, try a lower heat setting than you normally would. You can never be too careful! Brager is a fan of T3’s Smooth ID tools that can personalize heat settings to your hair type.

In an effort to maintain your style, it can be helpful to embrace your natural hair. “Style hair when it’s necessary, and let your natural texture flow whenever you can," says Brager..