10 days – 2 weeks
Hereof, are henna pens safe?
Henna Tattoos: All in Good Fun or a Health Risk? … This type of henna is dangerous because it contains paraphenylenediamine (PPD), a hair dye. When applied to your skin, it may look like a real tattoo, but allergic reactions to PPD can cause blisters, open sores, and scarring.
Subsequently, how long do temporary tattoo pens last?
around 2 days