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How often should you dye your hair with Demi-permanent?

Demi-permanent hair dye is a popular option for those looking to subtly change their hair color or cover up grays without making a drastic, permanent change. But how often can you safely re-dye your hair with demi-permanent dye? Here is a comprehensive guide on the recommended frequency for dyeing with demi-permanent hair color.

What is Demi-Permanent Hair Dye?

Demi-permanent hair dye, sometimes called deposit-only hair dye, is a semi-permanent hair color that lasts longer than temporary dye but is not as permanent as permanent hair dye. Demi-permanent dyes coat the hair strand and wash out over time, typically lasting 4-12 shampoos or around 6 weeks.

Demi-permanent dye does not contain ammonia or bleach and does not significantly lighten or lift the natural hair color. It is deposited only, meaning it adds color and shine but does not penetrate the hair shaft. For this reason, demi-permanent dye results tend to look more natural than permanent color.

Some key features of demi-permanent hair dye include:

  • Subtly enhances natural color
  • Minimally damages hair
  • Fades gradually over 4-12 washes
  • Does not lighten hair
  • Lower commitment than permanent dye

Demi-permanent dyes are great for blending gray hairs, refreshing faded color, or going a shade darker or lighter. They provide longer-lasting color than temporary rinses but with less damage than permanent dye. However, demi-permanent dye does not provide 100% gray coverage for all hair types.

How Often to Dye with Demi-Permanent Color

Most experts recommend waiting 4-6 weeks between demi-permanent hair dye applications. Dyeing more frequently than every 4 weeks can lead to hair damage and faded results. Here are some guidelines on demi-permanent dye frequency:

  • For subtle color refresh: Every 6-8 weeks
  • For full gray coverage: Every 4-6 weeks
  • For damaged or fragile hair: 6-8 weeks
  • For normal, healthy hair: 4-6 weeks

It’s best to assess the condition of your hair and your desired results. If your hair is dry or fragile, spacing demi-permanent dye applications 6-8 weeks apart allows more time for your hair to recover. For those with darker hair and minimal grays, you may only need a demi color boost every 6-8 weeks.

However, if you have over 25% gray hair or want complete gray blending, plan for demi-permanent dye every 4-6 weeks. The color molecules in demi-permanent dye gradually wash out over time, so lighter hair with more grays will show regrowth sooner. Doing demi-permanent dye any sooner than 4 weeks apart risks hair damage.

Tips for Healthy Hair with Frequent Dyeing

If you plan to frequently touch up your demi-permanent hair color every 4-6 weeks, it’s especially important to maintain healthy hair. Here are some tips:

  • Use a moisturizing, repairing shampoo and conditioner. Look for ingredients like jojoba, argan oil, keratin, or shea butter.
  • Trim split ends regularly. This prevents breakage and damage traveling up the hair shaft.
  • Do a deep conditioning hair mask weekly. Focus on mid-lengths and ends.
  • Avoid excessive heat styling. Let hair air dry when possible and always use a heat protectant.
  • Take biotin supplements or a multivitamin to support healthy hair.
  • Use Olaplex or a bond-building treatment to reinforce bonds before dyeing.

It’s also smart to give your hair an occasional “break” by extending time between demi-permanent dye jobs to 6-8 weeks when possible. This allows your hair to recover from the stress of coloring. Always do a strand test too, to check how demi-permanent dye takes to your hair before covering your whole head.

Demi-Permanent vs. Permanent Hair Dye Frequency

Permanent hair color involves a more aggressive process of opening the cuticle and penetrating the hair shaft. This allows permanent dye to create lasting color that does not fade out over time. However, permanent dyes use ammonia and peroxide which can damage hair over time. Here is a comparison:

Demi-Permanent Dye Permanent Dye
Deposits color on outside of hair Penetrates and changes color inside hair
No lightening or lifting Can lighten up to 3 shades
Lasts 4-12 shampoos Lasts until grows out
Minimal damage; safer for frequent use Harsher chemicals damage hair over time
Refresh color every 4-8 weeks Touch up roots every 8-12 weeks

As shown above, permanent dye allows you to go longer between color applications – typically 8-12 weeks. However, permanent color is best done less frequently overall to limit damage from the harsh chemicals required to penetrate the hair shaft.

When to Use Caution with Demi-Permanent Dye

While demi-permanent dyes are lower commitment than permanent color, caution should still be used in certain situations. It’s best to avoid frequently dyeing with demi-permanent color if you have:

  • Bleached or chemically lightened hair
  • Thin or fine hair
  • Sensitivity or allergy to hair dye
  • Damaged, broken, or brittle hair
  • Tightly coiled curls or very thick hair
  • Pregnant or breastfeeding

Even without ammonia or bleach, the chemicals in demi-permanent dye can lead to irritation, breakage, or allergic reaction on hair that is processed, fragile, or naturally dense and dry. If you have any of those hair types or conditions, consult your stylist and opt for less frequent dyeing every 8-12 weeks.

It’s also smart to do a patch test before dyeing hair that has been chemically lightened or relaxed, as the porosity is higher. Pregnancy and breastfeeding come with enough changes and uncertainty without adding possible skin irritation or absorption of chemicals from hair dye – so it’s best to use extra caution during those times.

How Long Does Demi-Permanent Dye Last?

On average, you can expect demi-permanent hair dye to last about 4-6 weeks. However, the longevity depends on several factors:

  • Hair color – Darker hair holds onto dye longer than light hair.
  • Percentage of gray – The more grays you have, the quicker roots will appear.
  • Hair condition – Dry or damaged hair fades faster than healthy, moisturized hair.
  • Shampooing – Frequent shampooing will cause faster fading.
  • Hair type – Coarse and curly hair tends to hold onto dye longer.
  • Water temperature – Hot water removes dye molecules faster than cool water.

Someone with over 50% gray hair who shampoos daily in hot water may need to re-dye in 4 weeks, while someone with 10% grays who shampoos twice a week in lukewarm water could go 6-8 weeks before their demi-permanent color fades.

Using a sulfate-free, color-safe shampoo and washing hair in cool water helps demi-permanent dye molecules adhere longer. Dry, porous, or color-treated hair tends to have a harder time holding onto dye. Going longer between washes gives the color more time to fully deposit and set.

Can You Dye Hair with Demi-Permanent Dye Too Often?

Yes, it is possible to overdo it with demi-permanent hair dye. Some risks of dyeing too frequently include:

  • Hair dryness and breakage – Repeated dyeing disrupts the protective cuticle layer, causing moisture loss.
  • Irritation or allergic reaction – Skin and scalp sensitivity can develop from over-exposure to chemicals.
  • Lackluster or inaccurate color – Too-frequent dyeing gives color molecules less time to properly set.
  • Premature fading – Overlapping dye applications can lead to uneven fading.

To keep hair healthy and achieve long-lasting demi-permanent color, it’s best to wait at least 4 full weeks between dye jobs. This gives your scalp and strands adequate recovery time. Quick touch-ups or color boosters should be kept to the mid-lengths and ends only.

When in doubt, do a strand test on a small section of hair to see how it reacts to repeated demi-permanent dye before applying it all over. If you notice any irritation, opt for gentler root smudging and focus touch-ups only where needed. Give hair occasional weeks off from any dye when possible.

How to Extend Time Between Demi-Permanent Dye

If you want to be able to stretch out your demi-permanent color longer than 4 weeks, here are some tips that can help it last:

  • Use a weaker 10 volume developer instead of 20 or 30 volume.
  • Apply to mid-lengths and ends only for touch-ups instead of full head.
  • Rinse with cool water and use sulfate-free shampoo.
  • Use dry shampoo between washes to refresh hair and scalp.
  • Avoid chlorine and salt water which can strip color faster.
  • Apply a weekly conditioning hair mask.
  • Use sun protection spray to prevent fading.
  • Trim hair regularly to prevent split ends and breakage.

You can also alternate between demi-permanent root smudging and semi-permanent gloss treatments. The gloss adds shine and helps seal in color molecules between full demi-permanent applications.

Talk to your stylist about at-home root touch-up kits as well. They allow you to easily re-do new growth in between salon visits. With proper maintenance, you may be able to safely extend demi-permanent dye to every 6-8 weeks.


Most hair experts recommend retreating with demi-permanent hair dye every 4-6 weeks for best results and to prevent damage from overprocessing. Those with darker hair and minimal grays can sometimes wait 6-8 weeks between applications, while those with over 25% gray may need to re-dye every 4 weeks for full coverage.

It is possible to overdo it with demi-permanent dyes, so stretching applications longer than 4 weeks apart when possible gives hair adequate time to recover. With proper at-home care and maintenance between salon visits, you can safely re-dye with demi-permanent color as frequently as every 4 weeks. Just be sure to do an occasional patch strand test and monitor your hair’s condition closely.