Wooden cheese slicers can be safe for food preparation if they are properly cared for and maintained. It's important to ensure that the wood used is food-safe and free from any chemicals or toxins. Look for slicers made from hardwoods like beech, maple, or bamboo, as they are less likely to absorb moisture or develop bacteria. These types of wood are also less likely to give off any unwanted flavors to the cheese. Regular cleaning and proper drying are essential to prevent the growth of bacteria on wooden cheese slicers. It's advisable to hand wash wooden slicers and avoid immersing them in water for extended periods. Applying food-grade mineral oil or a beeswax finish can help protect the wood and extend the lifespan of the slicer.