The thumb rule is to replace your clipper guards every 6 to 12 months or sooner if you notice any signs of wear, such as cracks or loss of shape. Clipper guards are durable but wear out over time with frequent use. The replacement frequency depends on the material and quality of the guards, as well as how often you use them. Regularly inspect your guards and invest in high-quality replacements to maintain consistent cutting lengths and achieve precise haircuts.