The hypothesis is that Listerine Antiseptic Mouthwash will kill the most alpha streptococcus.

You will isolate alpha streptococcus, make a suspension of the organism, inoculate plates with mouthwashes, measure zones of death with a caliper, and estimate the number of colonies within the death zones.

You will need cotton swabs, a blood agar plate, a blood agar slant, an inoculating loop, saline solution, a colorimeter, blood Mueller Hinton plates, a 10 microliter pipette, a 50 microliter pipette, an incubator, calipers, and an autoclave.

The experiment showed that Listerine Antiseptic Mouthwash was the most effective in killing alpha streptococcus, with the largest death zone around the area where the mouthwash was placed.

This science project is interesting because it helps to answer the question of whether or not the bacteria in our mouths is being killed by mouthwash.

Variations to consider include testing different types of mouthwash, testing different concentrations of mouthwash, and testing different bacteria.