glad to see you did a bit of research RAZD, but my answer to your post as it stood originally prior to your edit, wherein you claimed that oral bacteria and lower intestinal bacteria are both benign and neccesary to good health, remains.
Strangely the edits substantiate my original claim: most of the bacteria normally in the human body is benign OR necessary for the proper functioning of the human body. Even the benign ones serve a function in that they occupy space that otherwise could be inhabited by pathogens. If you did not have any bacteria in your body you would die of starvation. Sheer numbers alone do not tell the whole story.
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Considering your original statement and now a few short moments of research just opening your eyes for apparently the very first time, I can only suggest that you continue to research because your response is still extremely naive. 2 Minutes of research and a stop at wiki does not earn any applause, RAZD.
Curiously I've actually studied microbiology and done experiments on measuring fecal bacteria in natural environments as part of one of my degrees. As usual, your tendency for snide comments adds nothing to the debate, nor does it show that bacteria normally in the colon are necessarily worse than the bacteria normally resident in the mouth, which of course is the point that I made and then backed up with substantiation.