It has traditionally been considered less problematic to eat dairy products before meat, on the assumption that dairy products leave neither fatty residue in the throat, nor fragments between the teeth. Many 20th century Orthodox rabbis say that washing the mouth out between eating dairy and meat is sufficient. Some argue that there should also be recitation of a closing blessing before the meat is eaten,[99][100] and others view this as unnecessary.[101] Ashkenazi Jews following kabbalistic traditions, based on the Zohar, additionally ensure that about half an hour passes after consuming dairy produce before eating meat.[102]