pattie s.;40339 wrote: She has dentures but rarely wears them
If she had thrush, which it appears she does, I was going to suggest oil pulling.
It looks like Shay knows something about using tea tree oil for this, so she can tell you about using it.
I would advise your sister not to use the dentures at all until her infestation has healed. A lot of times dentures are actually a cause of Candida in the mouth.