Bread dough is scored with a sharp blade just before it goes into the oven to prevent it from cracking open at a random spot as it bakes. As the oven heats the dough, the gases inside expand quickly. Without a score to guide their release, pressure can break through at an unpredictable spot and leave a ragged surface. A well-placed score is both decorative and functional: it determines where the loaf opens as it rises in the oven (oven spring), helping the crust split in a controlled, even pattern.
Which blade and angle should you use?
The ideal tool for scoring is a thin, sharp razor blade (a lame) or a narrow-tipped kitchen knife. A dull blade pushes the dough instead of cutting it and can deflate the surface. Make the cut at a 45° angle rather than straight down. This angle helps the crust lift cleanly along the edge as the dough rises in the oven. The cut should be about 0.5 centimeters deep. A cut that is too shallow cannot support the dough's expansion and closes up; one that is too deep can release the gas too early and flatten the loaf.
When and how should you score the dough?
Score the dough just after it completes its final rise (the second proof), a few seconds before it goes into the oven. If scored too early, the cut starts releasing gas and the loaf may deflate before baking. Make the cut in one steady motion. Moving the blade back and forth like a saw tears the dough and leaves an uneven surface. It is enough to touch the blade tip lightly to the dough and pull it through in a single stroke.
How many cuts should you make, and what pattern should you use?
For round loaves, use one long diagonal cut or a crossed square pattern. Long loaves such as baguettes usually need 3–4 parallel diagonal cuts, each overlapping the previous one by about one-third. Too many deep cuts can disperse the dough's gas and flatten the loaf. A smaller number of cuts at the right depth produces a taller, well-shaped loaf.
Common mistakes
The most common mistake is scoring the dough while it is still very soft, during the first rise. At this stage, the dough is too slack to hold the cut, which closes right back up. The second mistake is letting the scored dough sit while the oven is still heating to the right temperature. The surface of scored dough left in a cold oven forms a skin early, preventing the cut from opening cleanly and causing the loaf to bake unevenly. Make sure the oven has fully reached the target temperature before scoring the dough.
How should scoring change for different types of flour?
Dough made with whole wheat or rye flour has a weaker gluten network than dough made with white flour, so make the cut slightly shallower—about 0.3 centimeters. Otherwise, the dough may spread too far along the cut and flatten. With high-hydration, wet, soft dough, the surface is sticky, so dip the blade in water or flour before each cut. Otherwise, it may stick to the dough and leave a torn, uneven mark. For low-hydration, firm dough, do the opposite: use a quicker, more decisive stroke because the stiff dough can slow the blade and crush the edges of the cut.