Shark Teeth: Eruption of a Front Permanent Tooth Behind a Baby Tooth

It is night time, my six year old daughter is standing on a stool in front of the bathroom sink.  I just finished brushing her teeth.  I am looking at the same situation I noticed a month ago.  A permanent lower front tooth is erupting behind the baby tooth.  Every night I test the mobility of the baby tooth and I ask myself a question every parent must ask,

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