Fig 3. PCoA beta diversity analysis of samples according to surface’s diagnosis, carbohydrate consumption and fluoride source.

(A) surface’s diagnosis: sound surfaces are represented in blue and surfaces with AWSL are represented in red; (B) carbohydrate consumption: low frequency are represented in blue and high frequency are represented in yellow. (C) fluoride source by water type: natural (ground) in blue, tap in red (no fluoride on both) and bottled in green.