Thanks for writing to us.
Headache,fever and metallic taste
in mouth are the symptoms usually associated with impacted wisdom tooth
which is inflamed.
As your dentist
has adviced,tooth has to be extracted to get the permanent relief.
Gargle frequently using lukewarm saline or betadine.
Take complete course of antibiotics-analgesics.
Maintain oral hygiene
Rinse your mouth after every meals.
Please do visit your dentist for further reference.
Hope this helps.