If the sinks and bathtubs in your home are taking longer than normal to drain, you probably have partially blocked drainpipes. These can be quite bothersome and can lead to messy and harmful flooding in your home. Your best bet is to contact a qualified professional as soon as you notice a problem.
Usually, clogged drains are caused by a buildup of grease and grime, most often from food waste or other organic matter, along the inside of the pipe. The sticky buildup can trap hair and other solids to further constrict the flow of wastewater and eventually become completely blocked.
Foreign objects accidentally sent down the drain can also cause a clog, as can the growth of roots from nearby trees into the sewer line.