What can i do for cracks on the side of my mouth?

CRACKS MOUTH CORNERS: Without looking i couldn't be sure, but it sounds as if you have a condition called, angular stomatitis or perleche. Often due to a yeast infection. Stop chewing gum, use a mild toothpaste (tom's of maine is a good one); don't eat raw fruit without cutting it up. A prescription product called mycolog cream can sometimes help.