Groups N Mean Resin-bonded bracket (12,000 ppm fluoride) 10 5.9 1.10 Resin-bonded bracket (1,500 ppm fluoride) 10 7.7 2.21 Resin-bonded bracket (900 ppm fluoride) 10 3.5 1.18 GIC-bonded bracket (12,000 ppm fluoride) 10 4.9 1.72 GIC-bonded bracket (1,500 ppm fluoride) 10 6.6 1.95 GIC-bonded bracket (900 ppm fluoride) 10 4.5 0.70 Total 60 5.5167 2.05

Table 3: Laser fluorescence values of enamel around brackets bonded with resin or GIC after treatment with three weekly fluoride treatments and TMPyP.