Several potential saliva‐based biomarkers of the AD pathological process have been described, with the canonical hallmarks of Aβ and tau and associated markers of axonal injury and brain inflammatory processes,30 indicated by neurofilament light chain (NfL) and glial fibrillary acidic protein (GFAP), respectively (reviewed elsewhere31, 32, 33). Here, MAPT is linked to Alzheimer disease.