* Advanced cutting techniques: Specific methods like balayage, advanced color correction, or men's cutting.
* New coloring techniques: Learning about the latest trends and products in hair coloring.
* Hair extensions: Courses focusing on application, maintenance, and removal of various types of extensions.
* Business courses: Improving salon management, marketing, or client communication skills.
* Product knowledge updates: Learning about new product lines and innovations.
In short, while a dedicated "refresher course" might not exist, cosmetology schools provide numerous continuing education options that serve the same purpose. It's best to contact schools directly and inquire about courses covering the specific areas a hairdresser wants to review.