CV boots are necessary because they function as a shield that prevents dirt, water, and debris from getting inside to destroy the constant velocity (CV) joints. Also, it is important to inspect them for tears, cracks, and loose clamps periodically. This can be done by tearing over time but regularly checking for tears, cracks and loose clamps on the boot on the pointed area if there any cracks or grease on it. In case of cracked covers or if the grease comes out through small opening then new boots have to be installed.