Hello there...
Little Luna has had a very bad breath during teething... She was killing me!!
I started using on her drinking water a couple drops of Burt's Bees peppermint breath drops (I got it at HEB on the "natural" stuff) and it seems to be working... it worked better on the water than directly on the mouth, even when she liked...
You may try it, hopefully it work also for you... She is much better now.
Good luck!