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Never. They constantly grow. The reason is unknown to me, but if your rodent is chewing on the bars of its cage, or something similar, it is normal. Just let it chew, unless it is chewing straight through the bar, in which case, get a new cage (this is unlikely to happen to you, but you may lose your pet if it gets out because it chewed so much).

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14y ago

What else can I help you with?