1. Unlock the brush head by turning it counter clockwise, and remove it from the handle.
2. Replace it with a new brush head. Turn it clockwise until it is locked into place.

When to Get a New Toothbrush?
Replace toothbrush every 3 to 4 months. Consider getting a new toothbrush sooner if you get sick, especially yor toothbrush is stored close to other toothbrushes. If bristles are frayed, they won't clean teeth as thoroughly. Because children often brush more rigorously than adults, they may need their toothbrushes replaced more often.

HOW TO REPLACE BATTERY?

1. Open the battery cap by turning it closewise.
2. Insert a new 3A battery with the correct polarity.
3. Put back the cap and turn it counter clockwise until it is locked.
4. Ensure no gap between the cap and the handle.

When to replace a new battery?
Replace a new battery every 2-3 months. Maintain a good vibration rate to ensure oral cleaning performance.