60-Day Head-Down Tilt Bed Rest Study Reveals 20% Salivary Flow Loss

This NPJ Microgravity study of 24 volunteers under a 6° head-down tilt protocol for 60 days found a 20% reduction in unstimulated salivary flow and a 30% rise in gingival inflammation, highlighting microgravity’s detrimental effects on oral health and informing hygiene protocols for at-risk patients.