*Both Outies and Invisalign have tools (available online) that will hook into trays to help you pull them off. This tool will work to push your trays off if they are too tight to hook into.
Step 1: What you need
2- A file
3- About 5 minutes
Step 2: Pull the tip off the plastic handle
This should leave you with a small ball shape attached to the flat side of a small cylinder shape.
Step 3: File the round ball and part of the cylinder into a dull wedge shape
Step 4: Try it out - PUSH (don't pull)
I don't use this tool to hook and pull the trays off. It's intended for trays too tight to hook anything into them. My fingernails are much happier, and it works with my attachments.
After five months of use, I see no wear on my teeth or the tool.