The term 'THEY'LL CURL YOUR HAIR' can be solved by two crossword solutions: rollers (7 letters) and perms (5 letters). Rollers are cylindrical devices that are used to curl hair. They are usually heated and come in a variety of sizes. Perms, on the other hand, are chemical treatments that are used to permanently curl hair. The chemicals break down the bonds in the hair, allowing it to be reshaped into curls.