Many patients who used CPAP before expect to feel a strong physical effect from the pressure of the air, which is the case for CPAP. Patient tolerate this discomfort in order to get treated.
When trying iNAP for the first time, they barely feel anything. This makes some of them feel that it's not right and conclude that the device doesn't work. But in fact it does. As long as you can see the blue light flashing, the negative pressure pump is working properly.
The table below compare the negative pressure in the mouth from different activities. You will certainly be surprised by these numbers! iNAP actually creates four time less pressure than when drinking with a straw.