• compression;
  • extension;
  • confocal;
  • oral;
  • structure

ABSTRACT: Elongational flows occur in the mouth when soft foods are ingested. Under those deformations, the food structure changes and influences the sensory perception in the mouth. To understand better how food structure deforms under elongational flow at the micrometer-length scale, a new configuration has been developed including a confocal microscopy and a compression apparatus. A model food system was studied, and the origin of elongational flow defined as the stagnation point was observed during biaxial extension. Repetitive deformations as they occur in the mouth during chewing showed structural evolution in the food system.