I know from person experience how painful thrush can be.  I have found that
nipples can remain sore even while being treated properly- especially if
they are cracked.   Putting a "dollop" of yogurt onto a clean handkerchief
and wearing it in the bra is quite soothing and I think that it aids in the
healing process.  It has to be yogurt with live cultures, and it must not be
a flavored one. (You'd be surprised how many people have asked what flavor
is best to use!)   I have used this with my own thrush, and have also used
it successfully with other moms (clients) as well.   I suppose ther is a
slight risk of skin irritation- but it feels soo good.  Nancy Sherwood LLLL,
IBCLC  in sunny Perth, Australia