I posted this same question on sci.med.dentistry, just trying to find
out if anyone has had the same thing happen.  I'm "hoping" it's sinus
related, at least partially.  The lightheadedness is more bothersome
physically, but the vibration sensation is concerning me
psychologically.  The lightheadedness I have is similar to having an
alcohol buzz, without the good feelings, and the sensations I get from
it tend to come from the lower forehead and directly between my eyes.

For the past few weeks I've been getting a strange sensation from my
teeth,
only from the upper teeth and from any of the upper teeth.  I've long
had a
habit of tapping on my teeth or catching my thumbnail on the edge of
one and
making a small snapping noise, no real pressure applied.  Sometimes I
also
tap my top and bottom front teeth together while thinking.  These are
just
habits I developed, I work about 10 hours a day on the computer and
have for
over a decade, I find myself doing these things when I'm staring at
the
screen thinking about a problem.

Over the past few weeks I've noticed that this behavior randomly
provokes a
fleeting sensation I can only describe as a buzz or vibration, very,
very
brief, very mild, not at all painful, but it runs from the tooth all
the way
up to my eyes - almost like it sets the eye vibrating for the briefest
of
moments.  Now, I know what you'll say - "If a behavior causes a
problem,
stop doing it."  Unfortunately this happens with any number of other
actions
that cause light movement across my teeth.  It does not happen with a
strong
tap of the tooth.  It does not happen with brushing.  What will cause
it is
to place my upper front teeth on the outside of my bottom lip as if
biting
your lower lip without applying much pressure and then pushing the lip
out
(this from the front teeth).  Also, eating something with a little
crunch to
it but that isn't particularly hard, like potato chips, can cause it
(this
from the molars) .  It doesn't happen with every action, but with
enough of
them that I'm noticing it repeatedly during the day, and I believe it
requires whatever is causing the sensation to move across the tooth
for a
bit rather than just striking it.  (For example the aforementioned
tap-tap
doesn't do the trick, but light contact will if, say, the skin or the
thumbnail or the food stays in contact with the tooth while moving
across it
for a second or so - almost like it's reverberating with a rubbing
action.)

In conjunction with this, beginning at the same time, I've been having
fleeting lightheadedness, more with head or eye movement but sometimes
it
happens with this same sensation from the teeth.  Both of these
sensations
are so brief that I'd say they're just long enough to sense, and no
longer -
less than a second easily.  The lightheadedness is not a spinning
sensation,
nor does it induce nausea, it's just bothersome.  It's usually
independent
of the teeth, but sometimes happens with it.

My girlfriend believes I may have sinus problems that are somehow
communicating a mild vibration or sensation upward toward the eyes (I
feel
this from the teeth through the nose and into the area between the
eyes) or
otherwise causing some sort of problem with eye movement and tooth
sensation
because of pressure.  The lightheadedness was particularly bad on
Sunday in
terms of frequency, but near the end of the night I felt a strange
moving
pressure between my eyes that grew and then seemed to 'open' over the
course
of about five seconds, after which the lightheadedness virtually
vanished.
I didn't notice the tooth sensation afterward much until this morning,
when
it's making itself known again.

My local GP gave me the "anything is possible" spiel but thinks I
might
simply have developed some sort of hypervigilance about this sensation
for
some reason.  It certainly doesn't seem like it to me, these
sensations came
on just as they are now pretty abruptly and may have gotten just a tad
worse
in terms of frequency.  I have no diagnosed problems with thyroid or
diabetes, no tooth pain at all, my gums aren't prone to bleeding and
are not
receded, and my last checkup looked good.  I do believe I clench my
teeth at
night sometimes, as I wake up maybe once a week with my teeth a bit
sore
(usually front teeth), a soreness that fades a bit after waking.  My
last
dentist told me he saw no signs of grinding.

The only thing that's changed is that a few weeks prior to this all
beginning we moved from Oklahoma to Kansas and I did begin getting
some mild
allergy symptoms and came down with a nasty bug of some sort that
lasted the
better part of a week with significant congestion and draining, but I
do not
now have sinus pain or noticable congestion, despite having what I
admit is
an increased amount of fluid that seems to run down the back of my
throat
(it's mild/light, but I notice it a lot throughout the day and night -
post-nasal drip I'm told).  I'm not sure if it's possible for sinus
problems
to be causing or amplifying this sensation, or if it's possible to
have
sinus problems without pain and obvious congestion.  I suppose a
problem
with the maxillary sinus might make sense given that it's only the top
teeth
and any of them (never once the bottom teeth) causing the problem.

Any ideas are greatly appreciated.  No one I've talked to around here
has
even heard of this sort of thing, and I can't find anything on the web
matching it.  At this point I'm getting into the "maybe it's a brain
tumor"
realm just because it seems so bizarre.