do teeth always erupt in pairs?

bbc mom

Registered User
My son's first 6 teeth have always erupted in pairs, but now he's had his 7th lower lateral incisor for well over a month and still no sign of the other one. Is this still normal? Thanks.
 
My son's teeth have done the same - he has 11 now, and they have never come up in pairs! Usually the 2nd isn't far behind though.
 
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