Teeth brush is transfer infection.

As in our mouth cavity are having many microorganisms, which are not worry you. As from an other person transfer in mouth cavity as if cleaning mouth a same brush, therefore such microorganism are pathogenic stay, as causing gingivitis, stomatitis, pulpitis, peridontitis, tonsillitis.
An in weak immunity they are entering through a mouth and in lungs, liver, kidneys and causing nephritis, pneumonia, cholecystitis. And use an individual teeth brush, keep her at clean, after cleaning teeth you must wash her in warm water,after soap good, and put in individual glass with head up.And on an every 3 months change her on new..