Polymethyl methacrylate microplastics affect oral microbiota diversity and <i>Streptococcus mutans</i> biofilm formation.

Both the NPs and MPs groups demonstrated an increasing trend in the relative abundance of Streptococcus and Streptococcaceae, with the MPs group displaying a statistically significant elevation in Streptococcus abundance compared to the CN group ( p = 0.037) ( Figure 2f ).

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