Table 3. Questionnaire return rates for the enrolled participants.

Description	Timing	N (received)	N (expected)	%
Patient survey demographic data	Before root filling	538	599	90
Pain and OHIP-14 survey before treatment	1st appointment	565	599	94
Dentist survey for treatment parameters	All appointments	582	599	97
Patient 2 weeks follow-up survey	2 weeks after RCT	518	599	86