Table 1 Inclusion and exclusion criteria for study participants

65–80 years of age at the start of the study

Brain trauma or stroke < 6 months

Impaired chewing ability

Neurological disease (stroke, Alzheimer's disease, other dementias, Parkinson's disease)

Missing teeth as indicated by Eichner index B2-B4, C1-C4

Other intellectual disability

Indications for treatment with fixed prosthodontics, implant and/or tooth-supported (overdentures included)

Psychological disorders

Mini-Mental State Examination (MMSE) score > 25

Participants with chronic pain, depression, or sleeping disorders

Daily analgesic medication that may affect cognitive and/or executive performance of the brain

Poor Swedish language skills, reading disabilities

Severely reduced hearing or vision

Exclusion criteria

Magnetic resonance imaging

Claustrophobia

Difficulties in lying down in a supine position for about an hour, or any other difficulties related to the MRI head coil

Participants with mental or medical implants in the body contraindicating MRI scan