Subject: Tooth brush cleaning

I am doing an experiment in which I have four toothbrushes and I 
clean my teeth with one after each two chocolates I have.Then I 
would clean all four toothbrushes a different way one being a 
dishwasher, another being a pot full of hot water, the third one 
poured over with mouthwash and the last one washed with water. 
Then I would put each toothbrush in sterile water and pour the 
sterile water into a petrie dish.  Then I would put the petrie 
dish in the stove over night with the light on.  Now I want to 
know what the easiest way for me would be to count the bacteria 
in the petrie dish.

Re: Tooth brush cleaning