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| Groups | Percentage of Reduction in the Colony Count Compared With the Control Group | P Value |
| CHX (0.2%) | 100% | ˂0.0001 |
| Phycocyanin (125µg/mL) | 12.8% | |
| Laser (4 min) | 15.02% | |
| Phycocyanin + Laser (125 µg/mL + 4 min) | 44.24% |
