> it was really hard to track one down that still had flouride in it

Oh, so you are one of those tin foil hat types that does not want fluoride in their toothpaste or drinking water? What the hell is it with fluoride and Internet randos? There is always one who pops into a discussion who has a hysterical story about why they avoid it. Repeating from my previous post, but this time about fluoride: <<Billions of people use X every day and have no issues.>>

The reason you check the canary is because the gasses are building up and will eventually become dangerous to the non-sensitive life in the mine. Toothpaste surfactants don't build up.