i am still convinced, that this will cause unknown implications after oral sex. as lactic acid is the main factor balancing the female intime floral ph.So introducing a bacteria that prevents this might be problematic.
Streptococcus mutans is not part of the vaginal microbiome. Lactobacillus seems responsible for lactic acid production in the vagina. Lactobacillus is also present in the mouth but it’s unlikely that this intervention will do anything to reduce the amount of Lactobacillus in the mouth let alone in the vaginal microbiome.