There is a mini spectrometer that you can aim at things
to
find out the chemicals in them. I think putting this in a
phone has been published.
What if a laser pen like thing could be aimed at the
tongue
near toothbrushing time to do spectroscopy? Could it
find any
health opportunities
like high cholesterol or trace
amounts of
mis-metabolites? Possibly.
If it is too much $ perhaps they could simply wave it at
your mouth when you go to the dentist.
I suppose one improved version of this could be part of
an
electric toothbrush with optical fiber bristles that got
really
near the tongue.
"laser tongue diagnostic" is not at the
first page of a search engine.