Henna tattoos are a great way to decorate the human body. They are applied for cultural purposes, as well as for enjoyment. They are not permanent, and can be a good determinant of whether or not a person wants a particular permanent tattoo. Regardless of the purpose for getting a henna tattoo, there are some simple steps that should be taken to preserve the tattoo so that it will last as long as possible. Henna tattoos can last anywhere from one to three weeks. The following is a simple guide to caring for a henna tattoo after it has been applied to the skin.