maybe candida (thrush)..yeast overgrowth bad bugs dig dark warm places and sugar...even if its fake sugar.
all sorts of things weird 'bad bugs" related issues start croppin up in VSG after IV antibiotics.
See your doc for sure...to diagnose may give ya a NYSTATIN swish...kinda roll it around in your mouth poof thrush gone.
Some home remedy type deals for thrush..wash mouth out with soap...lol no... apple cider vinegar, yogurt, or coconut oil. (I like this one the best!!).
Make sure you get rid of your toothbrush or disinfect in vinegar a bit of hyro peroxide in between brushin....cuz yer toothbrush is now contaminated! and ya may re-intro candida if it is indeed candida!
Can use like Candida Clear by Now...every now and again .....takes longer
so important you look into a COMPLETE MULTI-STRAIN PROBIOTIC ...with as high a count and as many strains as you can find. Take for 2 months feed em some fiber everyday (SF metamucil even) so they colonize n multiply....and your immune system (70% in large intestine) will LOVE YA!!
Very wide selection of COMPLETE probiotics and also candida clear...at VitaminCottage/Natural grocers, VitaminShoppe, health food stores...online lotsa places.