I am basing my question based off a question asked here.
It seems like from there the general consensus seems that toothpaste does not have to be kosher. The way the wisp works is that it is a mini disposable silicon toothbrush that has a little ball with cleaning ingredients in the center of the brush to clean the teeth (see here). There are two issues that Colgate wisps that may differentiate them from toothpaste:
- It is rinse free, so you are likely going to "consume" the entire ball.
- The third ingredient is gelatin, which they say is directly from pork.