Fig. 1

NMDS ordinations of samples showing sample dissimilarity patterns under the Bray–Curtis measure. a All samples colored by oral site (stress value: 0.16). b Tongue and saliva samples colored by oral site (stress value: 0.20). c All samples colored by subject number (stress value: 0.16). d Supragingival plaque samples colored by subject number (stress value: 0.16). e Tongue and saliva samples colored by subject number (stress value: 0.20)