EVAN ASH
Which liquids affect teeth surface
!
The purpose of my
project is to see which
liquids stain teeth surface
the most out of coffee,
tea, and cola. My
hypothesis was that coffee
would stain teeth surface
the most because it is
darker and stronger.
!
The materials I
used were 3 large
containers, coffee, tea,
cola and 3 hollowed out
eggs.
!
The procedure is
quick and easy. First,
hollow out three eggs.
Second, fill three
containers, one each with
coffee, tea, and cola.
Third, place one egg in
each container.
Fourth, take a picture of
the eggs every day for
three days.
!
The dependent
variable in my project is
the color of the eggs
shelly surface. The
independent variable is
the liquids (coffee, tea,
cola), and last the
controlled variable which
is the time the eggs sit in
the liquids and the amount
of liquids in the container.
!
My results did not
support my hypothesis.
Coffee barely stained the
shelly surface of the