Each participant in the experimental group received a 30 minutes of individualized VR-based simulation education in a dedicated oral skills training room.

The control group only received repeated questionnaires and did not receive any education about geriatric oral hygiene.

Virtual Reality Usage on Oral Care Knowledge about independent older adults

There were 10 items to evaluate the participants' knowledge of the geriatric oral hygiene scale Each item had three response options: true, false, and unknown. The total score ranged from 0 to 10 and a higher score indicated a higher level of knowledge of geriatric oral hygiene.

The attitudes of geriatric oral hygiene scale included seven items. Each item was scored on a five-point Likert-type scale ranging from 1 (strongly disagree) to 5 (strongly agree). The total score ranged from 5 to 35 and a higher score indicated a positive attitude toward geriatric oral hygiene.

The self-efficacy of geriatric oral hygiene scale included ten items. Each item was scored on a five-point Likert-type scale ranging from 1 (strongly disagree) to 5 (strongly agree) and the higher score was for a higher level of self-efficacy of geriatric oral hygiene, vise versa. The total score ranged from 5 to 50.

The behavioral intention scale of the geriatric oral hygiene included ten items. Each item was scored on a five-point Likert-type scale ranging from 1 (strongly disagree) to 5 (strongly agree), with a higher score indicated a higher level of the behavioral intention of geriatric oral hygiene. The total score ranged from 5 to 50.