Yes! Chewing gum can help to improve memory and enhance cognitive power. But to be more specific, it is not the gum that can actually improve our memory, but the act of continuous chewing or moving of our jaw. And gum of course induce the act of chewing, and can make chewing more fun!
The theory that chewing improves memory has some scientific basis because according to what I read, a group of Japanese researchers learned that the activity in the hippocampus, the area of our brain that is important for memory increases while people chew. And Dr Andre Scholey from the University of Northumbria likewise state that chewing increases heart rate and increased heart rate improves oxygen delivery to the brain which can enhance our cognitive powers.
Now we know the scientific reason why some people become more attentive and feel more alert when they chew gum and why does chewing can take away sleepiness. So the next time you feel slack when studying or feel sleepy inside classroom, chew some gum or move your jaw up and down to revive your cognitive power.