The first symptom of tooth decay is a brownish stain on the upper surface of the tooth (enamel). Then this stain becomes slightly larger and takes the form of a hole, food starts getting stuck in that place. Fragmentation accelerates the formation of food and makes the tooth hole larger. When this hole becomes a little deeper and reaches the inner surface (dentin), then we start to feel cold or sweet. When the rot goes into it even more then it reaches the pulp (tooth vein) and infects it, then we have more pain in the teeth.
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