| | Dental Health | Teeth Cleaning Is a toothbrush an insulator or conductor? An ordinary toothbrush made of plastic is an insulator. However, if the toothbrush has a metal handle or bristles, it becomes a conductor. Teeth Cleaning - Related Articles What number is high PSA level? Hepatitis B Symptoms in Men Vitamin B Shots & Weight Loss Laser Treatments of Flat Warts on the Face Can you die if have no stomach? Onset of Manic Depression Symptoms What Are the Treatments for Muscle Cramps & Restless Legs?