Final answer:
The HOB (height of the toothbrush handle) when brushing teeth should be at a comfortable height to prevent strain and maintain good posture.
Step-by-step explanation:
When brushing your teeth, the HOB (height of the toothbrush handle) should be around waist level or at a height that allows you to comfortably reach your mouth without straining your arm or bending over too much.
Having the HOB at a comfortable height is important to maintain good posture and prevent muscle strain or discomfort.
Remember to hold the toothbrush with a firm grip and use gentle circular motions to effectively clean all surfaces of your teeth and gums.