This one seems like it shouldn’t be necessary. But it has come to my attention recently that certain of my students (*ahem* rhymes with Shmevin *ahem*) have not been putting the proper time and effort into their dental hygiene, despite his or her parents’ best efforts. And so, with that in mind, a squeezy peasy eggs over easy Demo Science science demo that will (hopefully) remind and/or convince your students that brushing your teeth is not more than just a good idea.
Brush your dang teeth, Shmevin.
This one involves the use of a lot of soda pop, so you might want to plan this experiment around a holiday where you may be having a party (or, y’know, whatever—acknowledgement of?) in the classroom anyway. That way you’ll only have to answer for giving out soda to your students once. Trust me, waaay too many parents care waaay too much about their kids drinking one little glass of soda now and then (maybe two glasses, but they’re small [both the glasses of soda and the children drinking them (it evens out)]).
What you’ll need:
- one hard-boiled egg per student (pre-boil them, it’s not at all worth the trouble to do it in class, trust me [again])
- one plastic cup per students (think the ol’ Han-style ersatz measuring cup)
- a marker with which to write each student’s name on his/her cup
- enough cola, root beer, or other dark-colored soda to fill said cups full enough to dunk an egg in all the way
- one tube of toothedpaste(I recommend Tom’s for this experiment, because you don’t have to taste it in this experiment)
- enough toothedbrushes or, even better, little miniature brushes for each student to have their own (the mini ones are good because kids have small hands and eggs aren’t that big, either)
- extra soda for beveraging
Have each student gently place their egg into their cup. Then, fill each kid’s cup with soda until the egg is totally submerged and/or floating. Have them record their hypothesis of what will happen to the eggs as they soak in the soda. Pour some beveraging soda for the class to enjoy as they hypothesize.
Leave the eggs in the cola overnight. (Oh yeah, this is a two-day experiment, so plan accordingly.) Lightly cover the cups with paper towels or plastic wrap to keep debris out.
One Day Later
The next day, have your students retrieve their cups and slowly and carefully drain the soda out. Make sure they DO NOT DRINK IT, Shmevin! Pour it down the drain. Hopefully you’ve got a sink in your classroom. If not, plan accordingly!
What do the kids see when they see the eggs now, after hours of soak-a-cola? That gnarly staining is analogous of the plaque that forms on our teeth after we eat and/or drink beverages like soda pop. Like the now-darkened eggs, plaque can turn our teeth from white to tan to yellow to brown or worse.
Follow the metaphor, kids, and take up your brushes and toothedpaste. Give each student a dollop of toothedpaste and instruct them to brush it onto the shell of their egg as if they were brushing their teeth. If all goes as it should, they’ll soon have a clean white(ish) spot amid the taint. Make it as clear as you need to that this is the same thing brushing your teeth does for, um, your teeth. Etc. etc. etc.
BOOM. #scienced #hygiened