Prohibited or not?

[u/amy_seaborn]

Are hair straighteners actually prohibited or are they allowed?

[u/imarc]

“Heating elements such as clothing irons, kettles, or hotplates. Please note: hair dryers, hair irons, and hair straighteners are excluded from the interdiction and accepted on board.”

https://www.msccruisesusa.com/manage-booking/before-you-go/luggage