It is a common belief that cleaning causes loosening of teeth and also causes gap between the teeth. But this is a misconception.
A successful session of complete cleaning will eventually lead to strengthening of teeth in the socket as there will be no remaining infection causing debris and tartar.
The initial gaps that are seen after cleaning are caused because of the tartar that was earlier occupying the gaps between the teeth has been removed.
If this area is maintained well by the patient, these gaps get gradually filled up by healthy gums.