XD happiness...

hi for my science experiment i wanna test which part of the mouth has the most bacteria. To test this i will swab 4 people's mouths in three locations (cheek, tongue, teeth) at different times of the day (morning evening, night) I will then grow the bacteria and measure the growth of each before averaging it. I was wondering if the growth is enough to determine the area with the most bacteria? all other suggestions/changes will be appreciated! thanks