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Why your hair smells burnt after a flat iron

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Short answer

A burnt smell usually comes from one of three things: product residue baking on the plates or your hair, hair that is still damp, or heat that is too high for your hair. Clean the plates, make sure hair is fully dry, let heat protectant dry before ironing, and turn the temperature down. If you see smoke from the tool itself or smell burning plastic, unplug it and stop.

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A faint smell when you flat iron or curl your hair is common, but a strong burnt smell is a sign to stop and check. It does not always mean your hair is scorched. Often it is product on the plates or in your hair heating up. This page helps you tell the causes apart, gives fixes in order from easiest to hardest, and explains when the smell points to a problem with the tool. The same causes apply to curling irons and wands, so the steps work for both.

Common causes at a glance

Start by noticing when the smell happens. That alone usually points to the cause.

  • Smell even before hair touches the plates

    Likely cause
    Residue on the plates
    First fix
    Clean plates when cool

  • Sizzle, hiss or steam

    Likely cause
    Damp hair or wet product
    First fix
    Dry hair fully, let products dry

  • Smell on every pass, hair feels rough

    Likely cause
    Heat too high or too many passes
    First fix
    Lower temperature, one slow pass

  • Smell only with one product

    Likely cause
    That product reacting to heat
    First fix
    Use less, or switch to a heat protectant

  • Burning plastic or electrical smell, smoke from the tool

    Likely cause
    Tool fault
    First fix
    Unplug and stop using it
Burnt smell: what it usually means

Cause 1: product residue

Hairspray, oils, serums, waxes and dry shampoo leave a coating. When that coating hits hot plates, it heats and can smoke slightly and smell burnt, and it also builds up on the plates over time. If the iron smells when it is heating up with nothing in it, the residue is on the plates.

Clean the plates when the iron is cool and unplugged, using a damp soft cloth. Our guide on how to clean a flat iron has the full routine. Then change the order of your products: heat protectant first, let it dry, iron, and only then add hairspray or oils.

Cause 2: damp hair or wet product

Plate irons and curling irons are made for dry hair. If a section is still damp, the water heats fast, and you may hear sizzling and see steam with a burnt smell. The same happens with heat protectant or leave in that has not dried. Blow dry fully, including the inner layers at the nape, and wait a minute after spraying protectant.

If you want to style from wet, use a tool designed for it, such as a hot air straightener; see can you flat iron wet hair.

Note.Steam from damp hair can burn skin. Dry your hair fully before using a plate iron or curling iron.

Cause 3: too much heat or too many passes

If the smell comes with every pass and your hair feels rough or looks dull afterward, the heat may be too high for your hair or you may be going over the same section too many times. Typical maker guidance is about 250 to 300°F (121 to 149°C) for fine or color treated hair, 300 to 380°F (149 to 193°C) for normal hair and 380 to 450°F (193 to 232°C) for thick or coarse hair. Start at the low end and go up only if the style will not hold.

Take smaller sections and make one slow, steady pass instead of several fast ones. Fixed temperature irons like ghd's run at 365°F (185°C); with those, adjust section size and speed instead. The temperature guide tool shows typical ranges by hair type, and does a flat iron damage hair explains what heat does without overpromising.

Step by step: fix it in order

  1. 1

    Unplug the iron, let it cool, and clean the plates.

  2. 2

    Wash your hair to remove product buildup if it has been a few days.

  3. 3

    Dry hair completely, including underneath.

  4. 4

    Apply heat protectant and let it dry.

  5. 5

    Set the iron at the low end of your hair type's range.

  6. 6

    Use small sections and one slow pass.

  7. 7

    Save hairspray and oils for after styling.

  8. 8

    If the smell continues with clean plates and dry hair, or seems to come from the tool, stop using it and contact the maker.

When the smell is the tool, not your hair

A sharp burning plastic or electrical smell, smoke from the housing or cord, sparks, or a cord that feels hot are signs of a fault. Unplug it right away and do not use it again. Contact the maker; many premium tools carry a warranty, so check hair tool warranties. A new tool can give off a faint smell the first time or two as coatings settle; that should fade quickly. If you need a replacement, see the best flat irons or best curling irons.

See the best flat irons →

Frequently asked questions

Is it bad if my hair smells burnt after straightening? It is a sign to check your routine. Often it is residue or damp hair, but if it happens every pass, lower the heat and reduce passes.

Why does my curling iron make my hair smell? The same reasons as a flat iron: product on the barrel, damp hair or heat that is too high. Clean the barrel when cool and check that hair is fully dry.

Does heat protectant cause a burnt smell? It can if you iron before it dries. Spray, let it dry, then style.

Is a smell from a brand new flat iron normal? A faint smell the first few uses can happen. A strong burning plastic smell or smoke is not normal; unplug it and contact the maker.

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