Shark teeth are powerful tools that keep sharks at the top of the ocean food chain. But new research warns that rising ocean acidity could harm these deadly weapons. Human activities like burning fossil fuels increase carbon dioxide, which the oceans absorb, creating acid. Scientists tested over 600 blacktip reef shark teeth in water with today’s acidity and future predicted levels. Teeth in more acidic water developed cracks, holes, and corroded roots. These problems could make shark teeth weak and less effective for hunting. Lead researcher Maximilian Baum said, "Shark teeth are highly specialised weapons built for cutting flesh, not resisting ocean acid." Sharks rely on strong teeth to catch prey and keep the marine ecosystem balanced. Though shark teeth develop inside the shark’s tissue, protecting them somewhat, acid damage on exposed teeth is a concern as ocean acidity increases. Nick Whitney from the Anderson Cabot Center noted sharks’ 400-million-year resilience may help but does not remove risks. Ocean acid also harms other marine life like shellfish, making shells weaker, and fish scales that protect them. Scientists urge awareness and conservation to protect sharks and the oceans. Baum added, "The survival of their kind is vital not just for sharks but for the entire ecosystem in the seas around the world."