A gummy or wet crumb is one of the most frustrating sourdough results because the outside can look perfect while the inside feels undercooked or dense.
The key thing to understand is this: gummy bread is almost always about moisture, fermentation, or cooling, not just baking time alone.
Let’s break it down clearly.
The short answer
Bread is usually gummy inside because:
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it was underbaked
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it was cut too early before fully cooling
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the dough was underproofed or overproofed
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or there is too much retained moisture in the crumb
In most cases, the issue is about timing and moisture balance rather than a single mistake.
First: what “gummy” actually means
A gummy crumb feels:
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wet or sticky on the tongue
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dense and slightly rubbery
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under-set, even when fully cooled on the outside
This happens when the starches inside the loaf haven’t fully set or the moisture hasn’t properly redistributed.
The most common reasons your bread is gummy inside
1. Underbaking
This is the most common cause.
If the loaf is removed too early:
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the inside hasn’t reached full gelatinisation
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moisture remains trapped in the crumb
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structure stays soft and slightly wet
Even if the crust looks done, the inside may still need more time.
2. Cutting the bread too early
This is a big one.
Fresh bread continues to set as it cools.
If you cut too soon:
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steam escapes too quickly
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crumb structure collapses slightly
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texture feels gummy even if it was properly baked
Cooling is part of the baking process.
3. Underproofing
If the dough hasn’t fermented enough:
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starches and structure don’t fully develop
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crumb remains tight and uneven
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moisture gets trapped in dense areas
This often shows up as a mix of dense and gummy texture.
4. Overproofing
Yes—both can cause gumminess.
If overproofed:
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gluten weakens
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gas escapes unevenly
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structure collapses slightly in the oven
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moisture becomes unevenly distributed
This can create a wet, compressed crumb.
5. Too much moisture in the dough
High hydration doughs can sometimes:
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retain more moisture than expected
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need longer bake time to fully set
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feel gummy if not baked long enough
This is especially noticeable in beginner baking.
What you should do next time
Focus on:
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extending bake time slightly if needed (especially the final 10–15 minutes)
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checking that the loaf is fully baked before removing it from the oven
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allowing full cooling before slicing (minimum 2–4 hours)
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improving fermentation timing (not under or overproofing)
Often, one small adjustment fixes the issue.
Quick checks before baking and slicing
Ask yourself:
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Did I bake long enough for full internal set?
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Did I let the loaf cool completely before cutting?
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Was my dough properly proofed (not rushed or overextended)?
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Did the crumb look even or tight going into the oven?
These usually reveal the cause quickly.
When gummy bread is expected
Some slight gumminess can happen with:
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very high hydration doughs
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rye or wholegrain-heavy loaves
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beginner starter stages
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slightly underbaked artisan-style loaves
The goal is balance, not dryness.
Nikki’s note
Gummy bread is one of those problems that looks worse than it is.
In most cases, the loaf is almost right—it just needed a little more time in the oven or more time to cool and set.
Once you start trusting internal temperature and full cooling time, this issue becomes much less common.
Related guides
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Why Is My Sourdough Dense?
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Why Didn’t I Get Oven Spring?
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Why Is My Crust Too Hard?
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Why Is My Dough Sticky?
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Why Did My Loaf Spread?