Table 1.

All test groups according to TFI levels/bonding/etching procedures with codes (n=7).

TFI levels	Bonding/etching procedures
	Groups a	Groups b	Groups c
Groups 0	Group 0a	Group 0b	Group 0c
Groups 1	Group 1a	Group 1b	Group 1c
Groups 4	Group 4a	Group 4b	Group 4c

Groups 0: Non-fluorosed teeth in TFI=0

Groups 1: Fluorosed-teeth in TFI=1–3

Groups 4: Fluorosed-teeth in TFI=4

Groups a: SB total-etch bonding system/30s acid-etching procedure

Groups b: SB total-etch bonding system/60s acid-etching procedure

Groups c: PLP self-etch bonding system/no acid-etching procedure