my dog jumped on table and dropped a drinking glass to the floor. obviously i took a brush and cleaned it. later on my dad comes and starts yelling that i should have vacuumed that. he said that the glass for some reason breaks into small little dust that will penetrate thru your bare feet skin. is it true that the glass breaks into a somewhat big amount(an amount that would cause harm if stepped on, thats what i thought my dad said) of small dust that i cant even see, and then that dust would be more harmful than any other dust? why would the glass break into dust, it breaks into bigger pieces. and dust im talking about really fine flour or something.