1. Should the meat stuck between the teeth be removed during ghusal?
2. Should the white layer around the edges of the nail that may be dead skin or something like that be removed during wudhu or ghusal?
1. Yes. If it is a very small particle then the ghusl will be valid even if it is not removed.
2. No, it is not necessary.
And Allah Ta’ala (الله تعالى) knows best.
Mufti Ebrahim Salejee (Isipingo Beach)