For information purposes:

I went to see a dentist to have a crown re-cemented.  For some reason
while he was re-cementing my crown I touch the cement (straight glass
ionomer - no resin) with my tongue.  I had an immediate reaction,
really strange, but after the dentist was finish my tongue started to
feel numbness and tingling.  (No novicaine was used in this procedure,
it was a root canal tooth).  For about two days after I had numbness
in my tongue. The third day and hence had a burning sensation or
somewhat of one on the tongue.

Conclusion: maybe the might be something kind of toxicity in the
materials in the dentistry which can cause BMS.  (Glass Ionomer
cements are cytotoxic to cells when curing but not when cured - this
information was  retrieved from the internet).

If anyone else out there has BMS. You should consider what materials
or cements were used in your mouth.

P.S. I never had an allergic reaction to GI cements but I never touch
the cements while curing with my tongue either.