Milk can contribute to a type of rampant tooth decay known as “nursing caries.” This condition often occurs when a child falls asleep while breastfeeding or bottle-feeding.
During sleep, milk collects on the roof of the mouth and tongue, bathing the upper front teeth. Since saliva flow is reduced and the natural self-cleansing action of the mouth is diminished, the stagnant milk remains in contact with the teeth for extended periods.
The sugar content in the collected milk is gradually converted into acids. These acids cause the enamel to decalcify, or soften, leading to extensive tooth decay.