If it is hard to remove the nozzle from the AirFloss handle, it is important that you do not bend or twist the nozzle while pulling it off.
Below you will find easy steps on how you can do this:
1. Grab the nozzle/nozzle tip. You can use paper tower or cloth for better grip
2. Pull the nozzle/nozzle tip straight up from the handle
3. Once successfully removed, re-attach and remove a few more times
Note: Make sure that you are using the right nozzle type.