On the surface, the new playground that was unveiled yesterday morning at the BelovED Community Charter School in Jersey City looks like any other in the city. It receives the same reaction from kids, who looked at the slide and the monkey bars with wide eyes and big smiles. The playground, which is the first for the school, was built using recycled toothbrushes, toothpaste tubes and floss containers. The school itself won the playground as part of the Recycled Playground Challenge, a competition that was set up by Colgate, ShopRite and the recycling company TerraCycle, which is based in Trenton.