Objectives: The aim of the study was to measure the force exerted on the normal occlusion by the lips, cheeks and tongue. Methods: The resistance strain gauge transducer was used for measuring and sixty volunteers were measured. Results: 1. The series means and standard deviation of perioral forces of normal occlusion of Chinese were obtained. These data has provided the base of perioral forces for Chinese normal occlusion. It's very valuable for the further research on the relationship between the perioral force and dental arch form. 2. The perioral force is not related to the age, sex for the symmetry arch form, and the force on the bilateral side are similar. 3. There is not muscle force balance between the buccal and lingual side of the dentition in normal occlusion. The lingual pressure is lower during rest and higher during functional exercise. So, there must be other factors related with the force balance between the two side of dentition. The perioral force is only one of the important factor which affect the force balance and the dental arch form. 4. In this experiment, only one measurement system was used. More subjects and more areas on the dental arch were measured than previous studies. Conclusion: The perioral force can be measured and the force may be an important factor for dental arch form.

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