How long can we stay on puree?

My 14 MO is still OK puree only and milk and one bottle of formula a day

How long can we do this? Id like to wait till she has almost all her teeth in before doing real solids so she can shew and won't choke. She has 12 teeth now, no molars.

But is it OK to wait? I told her pediatrician she eats real good because I got nervous. I mean she eats food it's just in puree form