Stage 1 - Detection and analysis of VOCs connected with common oral diseases Known bacterial strains (Streptococcus mutans, Streptococcus sanguinis, Porphyromonas gingivalis, Fusobacterium nucleatum, Acinetobacter actinomycetemcomitans, Tannerella forsythia, Lactobacillus acidophilus) will be cultivated separately in sealed bottles containing appropriate media, enabling collection and analysis of the unique headspace inside the bottles. After cultivation, headspace will be collected into a Tenax absorbent tube (Sigma-Aldrich, 28718-U SUPELCOTenax® TA / Carboxen® 1018) and analyzed in GC-MS (Gas Chromatography-Mass Spectrometry). A unique volatile profile of every bacterial strain will be determined via a statistical analysis. The complete trial protocol is available in Addendum 1 below.