Teacher's gross bread experiment shows kids why they need to wash their hands

Every parent knows the battle we go through educating our children on the importance of hygiene.

But this teacher's genius idea for teaching kids about germs is a game changer.

Donna Gill Allen, from North Carolina, has gone viral with her stomach-turning experiment showing students just how dirty their hands can be.

All you need are three slices of bread.

"You let all the kids see you put a piece of bread in a baggy with a glove on hence 'controlled', then you wash your hands and put a piece of bread in a baggy for 'clean'.

"Last but definitely not least you pass a piece of bread around and let every kid in class touch it then you put it in a baggy and label it dirty.

"Watch how the bread changes over time due to germs.

"It is so cool and a great way to teach the importance of hand washing!"

After posting it on Facebook, the experiment has received more than 70,000 shares and 15,000 comments.