TPA test is a special test developed to imitate the movement of the teeth when biting. It consists of two penetration cycles of two centimeters (Figure 4). Several properties can be extracted with this test, but the more representative are hardness, adhesiveness and cohesiveness. Hardness is the maximum force at 2 centimeters depth in the first cycle, and this value should represent the feeling in the mouth when biting the gummy. Adhesiveness is read as the negative area measuring the effort made by the gummy to the probe in its way back between the two cycles. Cohesiveness is the way the gummy maintains its structure after the first cycle, and it is represented by the ratio between force in second cycle and first cycle.