A new system has been developed to assess dynamic combing force during shampoo and conditioner washing on both hair tresses and volunteers’ hair in salon studies. The system includes a fingertip sensor (Finger TPS system, PPS, USA) to measure the force applied on comb during shampoo massage, rinsing and after rinse stages. For each stage, the hair was combed for 20 times, and the average force, as well as max. and min. force applied were recorded and analyzed. As examples, hair conditioning of 4 commercial shampoos and conditioners were tested by the new system, and the data obtained were compared with those from common static method for combing force and sensory evaluation.

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