The statements presented to the participants after 5 minutes of synchronous vs. asynchronous brushing.

The participants were asked to rate the degree of their agreement vs. disagreement with those statements using the following scale: ‘+1’ = ‘I agree’; ‘+2’ = ‘I agree strongly’; ‘+3’ = ‘I agree very strongly’; ‘0’ = ‘I am not sure’, ‘−1’ = ‘I disagree’; ‘−2’ = ‘I disagree strongly’; ‘−3’ = ‘I disagree very strongly’. The last three columns of the table represent the number of people rating these statements with ≥+1 (yes), 0 (uncertain), or ≤−1(no).