This is a myth.
Some times a myth can have a story behind it that makes it very trustworthy.
This myth however has got absolutely nothing to it.
There have been no reported incidents of this phenomenon since the beginning of doctors.
For the sake of a possible solution where it could be possible..
Fetus in fetus.
But not likely at all.
It's about a comedy horror movie about a girl named Dawn who vagina dentata (teeth in her vagina).
Proper belta pal.
Vagina dentata is Latin for toothed vagina. Various cultures have folk tales about women with toothed vaginas, frequently told as cautionary tales warning of sex outside marriage
Ethmia dentata was created in 1966.
Hoplocorypha dentata was created in 1916.
Nannoarctia dentata was created in 1855.
Stenocara dentata was created in 1799.
Caloptilia dentata was created in 1990.
Melitara dentata was created in 1876.
Mastigoteuthis dentata was created in 1904.
Banksia dentata was created in 1782.
Donacia dentata was created in 1795.