Fig. 1

The direct influence of mastic on P. gulae activities. (A) Bactericidal effects of mastic against P. gulae at each time point. (B) Hydrogen sulfide and (C) methyl mercaptan production by P. gulae following 5 min co-incubation with mastic. (D) Representative images of gas chromatography of hydrogen sulfide and methyl mercaptan. Each result is presented as the mean (% or ppb) ± 1 SEM. n = 4 per group. p < 0.05 (Dunnett’s multiple comparison test) vs. control (0%) group. P. gulae, Porphiromonas gulae.