Background The effectiveness of pit and fissure sealants in preventing dental caries is well-documented. However, the preparation of the occlusal fissure surface prior to sealant application is crucial for ensuring optimal adhesion and longevity of the sealant. This study aims to evaluate various methods of preparing the occlusal fissure surface before the placement of pit and fissure sealants. Materials and Methods A total of 100 extracted human molars with intact occlusal surfaces were randomly divided into four groups of 25 teeth each. Group A received prophylaxis with a bristle brush and pumice, Group B was treated with air abrasion using aluminum oxide particles, Group C underwent acid etching with 37% phosphoric acid, and Group D was prepared using laser etching. Following the surface preparation, a resin-based sealant was applied to all samples. The teeth were then thermocycled between 5°C and 55°C for 500 cycles to simulate oral conditions. The bond strength of the sealants was tested using a universal testing machine, and the sealant penetration into the fissures was evaluated under a stereomicroscope. Results Group C (acid etching) showed the highest bond strength with an average value of 25 MPa, followed by Group B (air abrasion) with 22 MPa, Group A (prophylaxis) with 18 MPa, and Group D (laser etching) with 20 MPa. Sealant penetration was also highest in Group C, with complete penetration observed in 90% of samples, compared to 80% in Group B, 60% in Group A, and 70% in Group D. Conclusion The study concludes that acid etching with 37% phosphoric acid is the most effective method for preparing the occlusal fissure surface before the placement of pit and fissure sealants, resulting in superior bond strength and penetration. Air abrasion and laser etching also provide good results, while prophylaxis with pumice is the least effective.