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View submission: Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
You probably have bad breath. We adapt to smells that we smell all the time (like our own body odor, the smell of our house, and the smell of our breath) such that we don't notice it anymore. This is similar to how we stop noticing how our clothes feel on our skin after wearing them for a bit, or how we can ignore certain noises after hearing them for a while. Our brain decides these sensory inputs are noise and filters them out.
I would try some of the suggestions in the Mayo clinic link below and ask a trusted friend to assess how they work. If it doesn't improve in a week or so, I'd seek out an opinion from a dentist. Generally, regular brushing and a mouth wash can fix bad breath in just a day or two.
Evaluation of people with halitosis: https://academic.oup.com/chemse/article/40/1/47/2908176[1][2]
1: https://academic.oup.com/chemse/article/40/1/47/2908176
2: https://academic.oup.com/chemse/article/40/1/47/2908176
There's nothing here!