My Name Is Paul.. Im 19 And Im Asking On

my name is paul.. im 19 and im asking on behalf of my mother.. im based in ireland. My mam (mom) had three routh canals done.. and two front teeth are fake because she had two abceses which she got taken care of * Burst / flushed and givin antibiotics to kill the infection.. all was good for a few weeks but the abcess has come back again.. she again got it burst and flushed etc. But it has come back again .. My mother brushes her teeth everyday and is a neat freak.. so she is very clean.. her dentist dosnt know what to do.. help?