“… 36 Increased oxygen uptake by bacteria has been suggested to promote the aerobic degradation of glucose and further oxidation of lactic acid into less harmful substances when referring to dental caries. 37 , 38 In turn, L-ornithine could be a biomarker for healthy teeth. As an exception to the spatial patterns described above, N-acetyl aspartate and acetyl carnitine were found to be characteristic of CK rather than AT, whereas metabolically related metabolites, N-acetyl asparagine, and deoxy carnitine showed a reverse spatial distribution ( Figure S4 ).…”