What usually happens is that the client gets fed up of having two different textures and cuts the permed ends off once the natural locs are long enough.
Hopefully, you can see these two albums from my official page which show before and after images.
Client # 17: Audrey
Client #26 MJ
|with permed ends|
after the first trim - a year later
And here is my latest client who's just started and keeps her permed ends smooth and tightly curled.