@[USERNAME]they can afford best chalks in the world. these chalks consist about 28% of calcium this why these chalks very tough and u can draw long straight lines. and if someone have trouble with teeth it can be eaten as well. but before u need smash chalks or scrape off whiteboard and mix it with some limon- or other acid. without acid you wont consume calcium. they called also eatable chalks.####[['chalks', 'Teaching_Setup', 'POS']]