Have you ever wondered what a blood platelet actually does? Find out as the Once Upon a Time... series tackles biology.

Although antibodies mainly protect against bacteria, viruses, and other foreign substances, sometimes they can also attack your own blood cells! But this cartoon explains why you don't have to worry too much about that happening.

When the young platelets in this cartoon decide to have some fun and create a sort of "platelet pyramid" out of themselves, their older friend warns them that they could be causing a blood clot!

Watch the blood platelets in action in this fun cartoon. Moral of the story? Always listen to your mother.

The platelets vanquish the bacteria in the final installment of this animated series on blood. Who knew that a simple cut could be so epic?

Find out what happens in the body when we eat: the roles that teeth, the tongue, and nerve impulses play. But let's not forget about umami!

In this enjoyable cartoon about the human body, you will see the taste buds in action... when they're not slacking off!

Learn what happens when sugar and bacteria attack your teeth enamel... It's the price we have to pay for eating cake!

The battle between toothbrush and cavities ignites in this lively cartoon.

Guess what happens when little children forget to brush their teeth after eating sugar? Watch this fun cartoon and find out. You may never want to eat sugar again... unless you brush your teeth of course!

In the second episode of this animated series, we find out that not brushing one's teeth regularly can have dire consequences. The bacteria fight it out in this little boy's mouth and lose the battle, thanks to the dentist's drill.