SORU: boş bırakılan yere parçanın anlam bütünlüğünü sağlamak için getirilebilecek cümleyi bulunuz
Infections in the roots of teeth are very difficult to treat. ---- The infected material must then be cleaned out completely and the drilled section filled in. Although the procedure is routine, it is common for some of the bacteria to survive and, therefore, for infections to re-emerge shortly after treatment.