Hi Martin got thrush on the gums while going through TX. He had like a whithe moss growing on his gums. he got prescribed and antibiotic and it cleared in a week or less. they never advised us on foods to avoid, but I think they were more concerned about the weight at the time.
Martin has not had thrush since (*touch wood*). but he brushes his teeth with special sensodyne and covers his teeth and gums with gel-kam every night.