The number-one cause of bad breath is bacteria, which always exist in the mouth. Dr. Claudia C. Cotca says, “There are Between 500–1,000 types of bacteria in our mouths that we may use for metabolic breakdown, some of which don’t need oxygen to survive. When that’s the case, these bacteria live well in the pockets of the gums and on the tongue and thrive and multiply if left unchecked, which can lead to malodor in the mouth.”
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