Thanks for writing to us.
Pus discharge from the floor of mouth usually occurs due to infection of teeth as well as gums due to deep caries or periodontitis
Get a thorough clinical evaluation by a dentist
and pus has to be drained and curetted.Root canal treatment
has to be done if necessary.
I would advice you to maintain oral hygiene
Usually,doxycycline tab.has to be administered in such cases.
Hope this helps.