Final answer:
Over-mixing bread dough can result in tough, dense bread.
Step-by-step explanation:
Over-mixing bread dough can result in tough, dense bread. When dough is mixed for too long or too vigorously, it develops excessive gluten, which can make the bread dense and heavy. Gluten is the protein that gives bread its structure and elasticity, but too much gluten can lead to a tough texture. It is important to mix the dough just enough to evenly distribute the ingredients without overdeveloping the gluten.