Rodents gnaw on food with their chisel-like front teeth. These teeth, called incisors, are specialized for gnawing and chewing. Rodents use them to bite and scrape hard surfaces like wood, bark, and seeds to obtain food or to create tunnels and nests. Their incisors are continuously growing, and gnawing helps wear them down to a manageable length. The other options, molar teeth, strong jaws, and flat-ridged teeth, are also important for grinding and chewing food, but they are not specifically used for gnawing.