I had a very mild yeast infection about 5 months ago (verified by gyno). I treated it, thought it came back and treated it again with OTC meds a month or so later. Last week, my boyfriend went to the dr. and was diagnosed with oral thrush and he was also treated. My boyfriend said the dr. told him he got oral thrush from my vaginal yeast infection through sex (not oral sex because we have not had oral sex in years). My boyfriend said his dr said that he probably first got a male yeast infection that got into his body (systemic) and then caused the oral thrush. My boyfriend had no male yeast infection symptoms ever. I went to my dr. yesterday and he said it was not possible to get oral thrush from a vaginal yeast infection through regular sex. I am desperate for answers. Can someone help me to understand which dr. is correct so I can protect myself and my boyfriend in the future? Also, if my boyfriend has oral thrush and the dr blames my yeast infection could he be dismissing other issues? My boyfriend also has a dental plate he wears during sleep to keep from grinding his teeth, could this be the most likely culprit?