Different heat levels of a hairdryer should be adjusted to suit hair texture and condition. Use high heat for thick or coarse hair, the low setting for thin or fragile hair. If your hair is only damp (not wet) use the low heat setting to prevent over-drying.
Let hair dry naturally as much as possible before using your hairdryer, as blow drying wet hair can cause it to become fragile.
When you shower or bath, water penetrates each strand of hair. When you use your hairdryer or curling tongs, the moisture heats up and expands, pushing the hair fibres apart leaving open spaces. Those spaces make hair weaker and more susceptible to damage.
A poll found that the average woman spends 40 minutes a day washing, conditioning, blow drying and styling her hair, a total of 10 days per year.
The first hairdryer was created by Alexander Godefroy in his salon in France in 1890, he took inspiration from the vacuum cleaner. It was not portable or hand held, but instead the woman would sit underneath it.
By the year 2000, deaths by hairdryers had dropped to less than four people a year, a stark difference to the mid-twentieth century when there were hundreds of cases of electrocution accidents.