what was the point of ctrl r and giving the shape a holding edge?

[puds luls]

he has you do ctrl r after you do the fill of the bottom, what does he mean by giving it a holding edge?

edit: this was for the tooth

[Martin Bergwerf]

The so-called holding edge is there to ‘flatten out’ the bottom of the tooth:

These holding edges are often necessary when using a Subdivision Surface Modifier.

[Omar Domenech]

JL goes into SubD in this short lesson:

https://cgcookie.mavenseed.com/lessons/subdivision-surfaces

[Author]

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