They get moldy at the base of the bristles, although I wash them thoroughly after each use. I bleach them every two weeks because frequent replacement is too expensive (we change every 2-3 months). The baby brushes sit alongside the Sonicare adult brushes we use and they won't go moldy with the same care in the same environment. Super gross for my kids. Next time we buy new ones, we'll have to replace them with adult brushes.
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