Once you get past the initial ick-factor of toothbrush sharing, it's worth considering whether there are any actual harms.Whether we like it or not, our mouths are home to a unique microbiome.As Norman and Tegan explain, it's influenced by what we eat, who we kiss – and yes, who we might share a toothbrush with.ReferencesArmed to the Teeth—The Oral Mucosa Immunity System and MicrobiotaAssessment of Microbial Contamination of a Toothbrush Head with and without a Protective Cover: An Ex Vivo Study

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