...after a few hours sleep it occurs to me that I
failed to mention that the flashing and blinking
light is not being generated by.."them".
The effect is only observed when top illuminating them
with a powerful white LED flashlight...
as they cavort around, the light falls on different
part of their structure..causing the "glitter" effect.
When the view switches to bottom lighting, the "flashing"
ceases..and they appear as they really are..tiny critters
wandering around inside a goo ball.
...as there are something like 300 species of bacteria
resident in the human mouth, the odds are good that these
guys are quite harmless..
..at least they are not some species of spirochete..
......otoh...if they were spirochetes...this microscope
would not be likely to detect them in the first place.*
*I watched some vids on YT about spirochetes as they
are being detected in the mouth by smart dentists who
look for them...using phase contrast microscopes.
It was...amazing..to see how densely populated with
spirochetes some mouths are.