Male rats exposed to varying levels of fluoride for 90 days experienced changes in sperm motility and density. Compared to the control group, rats given higher levels of fluoride had increased average speed and beat cross frequency but decreased linearity, wobble, and mean angular deviation of sperm. The study found that fluoride poisoning can alter sperm movement and reduce sperm count, potentially harming the reproductive system. These results suggest that fluoride exposure may have negative effects on male fertility in rats.