You shape the loaf, place it in the proofing basket, and later notice that it still feels dense and tight. It has barely expanded, the surface looks firm, and the dough does not seem ready for the oven.

The good news is that underproofed sourdough can often be saved—provided it has not already been baked. The correct solution depends on when you notice the problem.

Underproofed dough has not produced or retained enough gas. It usually feels heavy rather than light and airy. After shaping, it may remain almost unchanged in the basket.

When gently pressed, the dough often springs back quickly, although the finger-poke test should not be used alone. Cold dough and strong dough can also recover quickly.

Look at the entire loaf. Properly proofed dough becomes slightly fuller, softer, and more delicate. Underproofed dough stays tight and may resist scoring.

After baking, the signs become clearer. The loaf may tear at the side or bottom, rise sharply in one place, or develop large tunnels near the top surrounded by dense crumb. These are signs that the dough still contained a great deal of unused fermentation potential when it entered the oven.

Sometimes the problem begins before shaping. The dough is divided and shaped before bulk fermentation has developed enough gas.

If you realize this immediately, you can return the dough to a lightly covered container and allow fermentation to continue. This is easier if the dough has only been pre-shaped and has not yet received its final shape.

If the loaf has already been shaped, repeated unfolding and reshaping may damage the gluten and remove the small amount of gas it has produced. In that case, it is usually better to continue with a longer final proof.

Move the dough to a comfortably warm place rather than applying strong heat. A dough temperature of around 24–26°C usually supports steady fermentation without making the dough excessively soft.

A shaped loaf that still feels tight simply needs more time.

Keep it covered so the surface does not dry out. Allow it to proof until it becomes noticeably lighter and slightly larger. The dough should feel aerated beneath the surface rather than solid.

Do not wait for the loaf to double. Many sourdough loaves are ready to bake after a more moderate increase in volume.

Check it regularly, especially in a warm room. Underproofed dough can be corrected with more time, but if forgotten for too long, it can move into overproofing.

Cold temperatures slow fermentation but do not always stop it completely. If a chilled loaf still appears clearly underproofed, it can remain in the refrigerator longer.

If fermentation is moving too slowly, take the covered basket out and let the dough continue proofing at room temperature. Depending on the dough and room temperature, this may take from 30 minutes to several hours.

Do not bake only because the recipe says that the refrigeration time has ended. Some dough enters the refrigerator before fermentation is sufficiently developed and needs additional time afterward.

Once the loaf looks fuller and feels lighter, it can be returned briefly to the refrigerator if firmer dough is needed for easier scoring.

Reshaping is helpful only in limited situations.

If the dough is still early in fermentation, contains very little gas, and has clearly been shaped too soon, one gentle reshaping may be possible after additional fermentation.

If it already contains visible bubbles, do not repeatedly tighten it. Each attempt removes gas and damages the structure. A longer proof in a correctly sized basket is usually safer.

The proofing basket supports the loaf while fermentation continues, so dough does not need to stand perfectly upright on its own.

Once underproofed dough has been baked, the crumb cannot be changed. The bread may be dense or contain large irregular tunnels, but it is usually still edible.

Allow it to cool completely before cutting. Slightly underproofed bread can be used for toast, grilled sandwiches, croutons, or breadcrumbs.

Then use the baked loaf as a guide for the next bake. Extend bulk fermentation, check that the starter is used near its peak, and make sure the dough is warm enough to ferment steadily.

Underproofing is not corrected by stronger shaping or a hotter oven. It is corrected by giving active dough the time and suitable temperature it needs before baking.