Why your sourdough comes out dense or gummy (and how to fix each one)

Dense means tight, small holes and a heavy loaf, it never rose enough. Gummy means a sticky, pasty, almost raw-feeling crumb that clags on the knife, the holes might be fine but the texture is wet and claggy. They feel related because both come out of a disappointing slice, but one is about how the dough fermented and the other is mostly about the bake and the cooling. Naming which you actually have is 80% of solving it.

A dense loaf almost always means the dough didn't ferment enough before baking, so there wasn't enough gas to open the crumb. Two usual causes: the starter wasn't at peak when you mixed (so it was sluggish from the start), or the bulk rise was cut short, often because a cool kitchen slowed it and the clock said it was time anyway. The fix is to ferment to the dough's actual state, not the recipe's clock: a stronger starter used at peak, and a longer bulk in a cool room.

Gummy crumb is usually the opposite end of the process. The two big culprits: the loaf came out before the inside was set (pull it later, or check the internal temperature, around 96 to 99C for most sourdough), or, just as common, it was cut while still warm. A sourdough loaf keeps cooking and setting as it cools; slicing into a hot loaf releases steam the crumb needed and leaves it pasty. The cruel fix is patience: let it cool fully, often a couple of hours, before the first cut. Over-fermentation can also cause a gummy, slack crumb, which is why the diagnosis matters.

Here's why bakers stay stuck: they change three things at once and never learn which mattered. A loaf is the end of a chain, starter peak, bulk time, kitchen temperature, shaping, bake, cool, and you can't debug a chain you didn't record. Logging each bake in Sourdough Tracker (when the starter peaked, how long the bulk ran, the room temp, the result) turns "why is it always dense?" into a readable pattern: oh, every dense loaf had a bulk under four hours in a 19C kitchen. The fix stops being guesswork.

Here's the whole thing on one page. Tap it to download, or pin it for your next bake.