1, the dough may not ferment because the yeast loses its activity. In this case, it is necessary to prepare new yeast, add it and new flour to the dough, and knead and ferment again. In addition, if the ambient temperature is too low, the dough will not ferment. At this time, just increase the temperature around the dough.

2. In addition, if the temperature around the dough is too low, the dough cannot be fermented. In this case, you need to put the dough in a heated room or ferment it with a pot of hot water.