Straighteners are devices used to make hair straight.
Straighteners are often used by people who want to change the way their hair looks.
Examples:
She uses the straighteners to make her hair straight.
Do you know where I put the straighteners?
The straighteners are on the bathroom counter.
The straighteners make her hair look very different.
Her straighteners are like magic wands for her hair.
The straighteners are hot and can burn you if you touch them.