Most people replace your toothbrush with a new only after a significant deterioration of the old. However, the German expert called the occasion for which it is necessary to do before - colds.
Dentist Dr. Thomas Wolf of the board of the Free Union of German dentists recommend after recovery from colds to buy a new toothbrush. Otherwise, the brush holder can again get the same infection due to bacteria that are hiding in the stubble.
The expert said that is enough to have oral hygiene only one toothbrush, replaceable regularly every 6-8 weeks, except in cases of colds.
Brush with stiff bristles in a pinch can be used up to three months, but no more. After professional tooth cleaning brush is optionally replaced immediately.