Problems such as bleeding gums, gum recession or loose teeth need to be brought under control before orthodontic treatment begins. This is done by a periodontist, who decides when straightening the teeth can begin.
The periodontist's work does not end once you are ready for orthodontic treatment – they also need to monitor the health of your gums during treatment to avoid complications.
This answer is for general information. Your own case needs an examination by an orthodontist.