During battle, if one of the players sets up Toxic Spikes/Spikes and the opponent at any point sends out a Flying-Type Pokémon or a Pokémon with the ability Levitate then the hazards will permanently disappear from the field as they don't affect those Pokémon. Same thing goes for using Spikes/Stealth Rocks against a Pokémon with the ability Magic Guard, as the Magic Guard Pokémon is switched in the hazards disappear from that side of the field.