A flexible saliva suction cannula (1) characterized in that it is provided with at least one hole (7) or a plurality of holes (7) which can be made in the proximity of its end (4) provided with a saliva suction cap or plug (5). Said innovative holes (7) implement a practical application of the Venturi effect, optimizing the step of suction of the patient's saliva through the section of the cannula (2). The cannulas (1) can be made of any known (PVC or polyethylene) or less known plastic material. The industrial manufacturing process is applicable within the same known industrial process of the current cannulas with the provision of adding therein a radial piercing step of the cannula (2) at its end (4) provided with a cap (5), as well as a final sanitation step of the cannulas (1) thus produced.
