All humans have only have two sets of teeth one soon after birth to be replaced again from the age 6yrs to 12 yrs in a lifetime. Considering your daughters age it may have been a deciduous molar replaced by a permanent pre-molar.
Next Steps
Any confusion can be clarified with a periodic checkup with your dentist.
Health Tips
IDA recommends a minimum once in six months visit to the dentist to keep your teeth and gums healthy.
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