Dr. Best toothbrush with fine and silky bristles for better accessibility of interdental spaces. Dentists recommend changing the toothbrush every 3 months at most. Safety warning: with too much stretching, the brush head may break. Children under 6 years old should be supervised when brushing their teeth. Do not chew on bristles and toothbrush. Dentists recommend changing the toothbrush no later than every 3 months.