Spaghetti breaks because of thermal shock and cheap pasta

Yes, that’s the main reason. When dry spaghetti hits boiling water, the sudden temperature change creates internal stress. The outer layer expands faster than the core, and if the pasta is brittle or the water isn’t hot enough, it snaps into pieces mid-cook.

The fix is simple: use a pot wide enough so the spaghetti can lie mostly flat, or at least bend gently. Don’t cram it into a small pot. Bring the water to a full rolling boil before adding the pasta — not a simmer, not “kinda bubbling.” That ensures the heat transfer is immediate and even. Stir within the first 30 seconds to separate strands.

Cheap pasta (smooth, extruded through Teflon dies) is more prone to shattering. Spend a few extra bucks on bronze-die pasta — it’s rougher, holds sauce better, and is structurally stronger. Also, old pasta gets brittle, so check the expiration date.

If you do end up with broken pieces, just accept that spaghetti al dente is not a uniform length thing.