Heavy furniture can definitely cause permanent dents on vinyl flooring. This is especially true if the furniture has narrow legs or small surface area that concentrates its weight. Over time, the pressure can cause the vinyl to deform and lose its shape. To prevent this from happening, it's important to distribute the weight of the furniture evenly by using furniture pads or coasters. If you already have dents on your vinyl flooring, you can try using a hair dryer or hot water to soften the material and then gently push the dent out. However, if the dent is too deep or widespread, it may require professional repair or replacement.