materia alba
noun plural
ma·te·ria al·ba
mə-ˌtir-ē-ə-ˈal-bə 
: a soft whitish deposit of epithelial cells, white blood cells, and microorganisms especially at the gumline
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“Materia alba.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/materia%20alba. Accessed 30 Dec. 2024.
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