Anionic toothbrush has an internal-set high energy battery to make use of the anionic source produced by direct current electric field. It can avoid and prevent oral diseases. Brush handle has an anodic slice inside while brush itself contains anionic source. When people brush the teeth, the brush will be filled with saliva and tooth paste. These saliva and tooth paste will touch teeth and gum to make electric current form a loop with human body. Product function 1. To eliminate or release the toothache and gum bleeding; 2. To clear up tartar efficiently; 3. To dispel halitosis; 4. To solidify loosen tooth; 5. To prevent decayed tooth, eliminate tooth nature sensitivity; 6. To cure and prevent oral ulcer.