The 3-point cantilever bending technique is a test used to measure the strength and flexibility of the hair. It involves applying a force at a specific point between two supports and measuring the amount of deflection at the middle point. The amount of deflection measured can be used to calculate various properties of the hair, such as its stiffness, toughness, etc.

With its ability to measure multiple parameters, the three-point bending technique is a versatile method for hair care product developers to make claims about the benefits of their styling products.