DD has started eating in past few months and in last 2 weeks had been drinking soy milk and only having one b/feed. My DH brushes her teeth with VERY small amount of toothpaste each day (well most) yet the last couple of days I've noticed her breath is quite stinky

Does this mean we need to brush more often - I think we'll go to twice a day now but could there be something else or is this normal? When she was b/fed her breath was soooooo nice!