Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
Decreased body temperature is common after sweating & this might be symptom of
excessive sweating & doesn't denote any problem.
Tooth decay doesn't cause decreased body temperature and sweating. You should visit a
dentist for treatment of
dental decay, if you have them to prevent any dental complications.
Decreased body temperature and sweating is commonly due to systemic conditions like
low blood sugar, excessive sweating, low blood pressure, etc.
so you should visit physician, if problem persists & blood tests may required for diagnosis.
In meantime you could take
acetaminophen & drink ample amount of water.
Don't worry you would be fine
Hoping your query is solved.