Awareness on selection of toothpaste !

 Pay attention when buying toothpaste.
At the bottom of the toothpaste tube
there is a color bar. And now I know
the meaning of the color bar!
... Try to choose green and blue, there are four kinds:

Green: natural;
Blue : Natural + Medicine;
Red : Natural + Chemical composition;
Black : pure chemical.

(Colgate is red, hence the foam)