INTRODUCTION A foam is a substance that is formed by trapping pockets of gas in a liquid (or solid). Depending of the final application, they could be very unstable products with a shelf life that doesn’t exceed few minutes. In the case of hair foams, the breaking of the product has to be quick to enable an easy application. Therefore the kinetics of breaking is a fundamental parameter for the formulator. However, this characterization is very difficult to perform due to the rapidity of the phenomenon. Thanks to the Turbiscan™ technology and its ability to measure in “fixed position” mode, it is possible to study and characterize very unstable foam. In this application note two study were done, one to measure the effect of temperature of hair foam and one to evaluate the repeatability of the measurement for this application.