title: Systems of life. No 140. Senior systems. 5.
mesh_terms: D000368:Aged; D000375:Aging; D005157:Facial Pain / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D009055:Mouth / Q000502:physiology*; D009059:Mouth Diseases / Q000503:physiopathology*; D012463:Saliva / Q000502:physiology