Just out side Xanadu China, in the northern Provence there is an old woman in a small house with a table a pocket knife and a large roll of tooth brush brissle material. She meticulously cuts each one and inserts them one by one into each hole, 50 brissles per hole 50 holes per brush. She's very good at what she does and very fast also.
Her pay is a can of sardines and a good a** beating on Friday.
Now with that back ground knowledge: does your tooth brush ever smell like fish?