The answer to 'how to prevent bed bug' is to take proactive steps to identify and eliminate bed bugs before they become a major infestation. This includes regularly inspecting your home for signs of bed bugs, using protective covers on your mattress and box spring, and quickly addressing any bed bug issues you find.
Start by carefully inspecting your home, especially your bedrooms, for signs of bed bugs like small blood spots, shed skins, or the bugs themselves. Bed bugs often hide in cracks and crevices, so be thorough in your inspection. If you find evidence of bed bugs, act quickly to contain the problem. Wash and dry all bedding, clothing, and other fabric items on the hottest setting, and use a vacuum with a HEPA filter to remove any bugs or eggs. You may also need to use insecticide sprays or powders in affected areas to fully eliminate the infestation.