i am in 6th grade and for my science project i am seeing whether a dog's mouth is cleaner then a human's. so far i have taken a swab of saliva from both a human's mouth and a dog's i then put them in two different petri dishes (with agur) but i don't know how i would measure the bacteria to get i good idea on how much more bacteria grew then the other. also i have left the dishes out on my kitchen counter but nothing has grown yet and it has been a whole three days! and i need the results in two days! i'm very worried!!!
Actually, you do have results. The result is that nothing has grown. That is a valid scientific result. One of the best lessons you might take from this class is not to anticipate what you expect your experiment to produce. Your teacher might appreciate that.
You should document your procedure carefully to show that you followed instructions and then you should report your results accurately. That's the scientific method.
If the bulk of similar experiments (from classmates or other sources) produce radically different results, then you might question the conditions of your experiment. For example, maybe your little sister or brother came along and sprayed Lysol into your experiment as a joke. But these are all different issues from reporting your results.
You might also report your results on this batch, and then repeat the experiment several other times with more controlled conditions. And then report those results accurately.