How Does Laser Hair Reduction “Removal” Work?
Hair contains a pigment, melanin, which gives it colour. This pigment can preferentially absorb certain spectra of light. Thus, laser or BBL can be used to destroy these pigment-containing hair. As skin also contains melanin, care must be taken to choose the type of laser that will destroy the melanin-containing hair preferentially, while sparing the surrounding skin.
How Efficient Is “Laser Hair Removal”?
Although each individual is different and their bodies react differently to the treatment, generally only hair in active growth phase can be destroyed during treatment with any laser or light-based technology. Completely destroyed hair follicles result in permanent damage so no hair can grow back. For hair follicles that are partially damaged, new grown hair later will grow at a slower rate and tend to be less visible.
This represents, on average, 20% of body hair destruction at any given time in a single session. Multiple treatment sessions are required to remove the bulk of body hair.
Laser/IPL hair removal is approved by the FDA for permanent reduction (most common results lie between 40% and 80%). On average, it can effectively achieve hair reduction by about 70% after a full cycle of treatment.
Is laser hair removal result permanent?
For hair follicles that are completely destroyed, it’ll result in permanent damage so no hair can grow back. For follicles that are partially damaged, new grown hair later will grow at a much slower rate and tend to be less noticeable.
Since laser technology cannot guarantee complete destruction of all the targeted hair follicles, laser hair removal is never 100%*, no matter how advanced the technology or machine is. The more appropriate term should be “laser hair reduction“.
* Electrolysis is the only method approved by the FDA for complete permanent hair removal.
