I wouldn't recommend sticking your fingers in your mouth or eyes after using a cube recently sprayed with silicone. I think it might be a really weak irritant at best.
There's a lot of food grade silicones that get the job done but they don't last that long. CRC 808 is a lot better, but once again, you don't want this stuff in your eyes.
It's also worth noting that you shouldn't be too libereral when spraying it. It should be done in a well ventilated room or outside. Just like you wouldn't want to breath in deodorant, you wouldn't want to breath in silicone.