The milk used to make yogurt contains a higher concentration of solids than normal milk. By increasing the solids content of the milk, a firm, rather than soft, end product results. Addition of nonfat dry milk (NFDM) is the easiest at-home method for doing this.[62] Another method is using scalded milk: heating milk near boiling, then letting it cool down to 40 to 46 °C (105 to 115 °F). The process denaturates whey proteins, which makes yogurt thicker.