Mehndi, just like Moroccan Henna is also a safe way to temporary tattooing, that has been practiced in the East for centuries. Just like Moroccan and Arabic Henna, there is a whole history with traditions and cultural beliefs to it's application and the symbols of it's patterns. Also since the Mehndi is a natural herbal blend it soothes and conditions the skin.
The use of Mehndi Oil is widely adapted to help the dye take.
Mehndi decoration became fashionable in the West in the 1990 after many stars started designing it on their body as a fashion statement.