Hair perm is one of the most technical and difficult hair services you can get in a hair salon and the beautiful curly result comes with many risks for your hair. Luckily Japanese hairdressers and hair industry manufacturers are earnest scientists when it comes to hairdressing techniques and technology. They always study and experiment eagerly for a better result, meaning non-damaging better curls.
In Japan, the permanent service is much more common in hair salons than in West. According to the Japan Perm Association, in 2015, 30% of people aged from 20 to 60 had a perm. I, personally, have been perming my hair about every 4 to 6 months for maybe the past 15 years.