Human skin is an amazing organ -- protective, waterproof, and exceedingly useful. It's also constantly changing and regenerating itself. That said, what happens to dead skin cells? You might be a little grossed out to find out where they go and just how many you lose each day.
New keratinocytes grow at the lowest level of the epidermis, which bonds with the next layer, the dermis. The new skin cells gradually push their way to the top layer. When they reach the top, they die and are "weathered" by the environment and your daily activities. The top "dead" layer is called the stratum corneum. Eventually, the dead cells break away from the epidermis and fall off, making room for newer cells growing up from below. It takes roughly one month for new cells to get all the way to the top layer, meaning the skin you have a month from today will be completely new compared to the skin you have now.
Where do they all go? The dust that collects on your tables, TV, windowsills and on those picture frames that are so hard to get clean is made mostly from dead human skin cells. In other words, your house is filled with former bits of yourself. In one year, you'll shed more than 8 pounds (3.6 kilograms) of dead skin. It gets even grosser: Your house is also filled with trillions of microscopic life forms called dust mites that eat your old dead skin.