doesnt signify always infection .although it can be infection, it can be due to number of other factors also , like due to pregnancy, she may be taking undue stress which may be manifesting as bruxism
which can lead to pain. it can be due to pregnancy gingivitis
. it can be due to various other reasons also. the point here is that get yourself clinicaly examined. and as your 3rd trimester is going on, so no extraction is advised. for pain relief, take paracetamol
( SOS ) and if theirs infection, you can take amoxycillin
500mg three times a day. both these drugs are safe during pregnancy.
wishing you healthy future
with best regards