Normal gum is hydrophobic (does not mix with water), and things that dissolve immediately are hyrdophilic (mix well with water). But Rev7 is amphiphilic, a combination of both. So you can chew it, but it allows enough water to penetrate it that it will slowly break down, and can be removed from a sidewalk with normal cleaning techniques.
The new gum comes in peppermint, spearmint, and cinnamon flavors. If you’d like to give Rev7 a try, you can check out the link below for a list of locations where it is available.