Final answer:
The toothbrush bristles focus brushing efforts to the cervical and interproximal areas of the teeth, which help remove plaque and prevent dental issues.
Step-by-step explanation:
The area that focuses brushing efforts to the cervical and interproximal areas of the teeth is the toothbrush bristles.
When brushing, it is important to use a toothbrush with bristles that can reach these areas. The bristles should be able to flex and get into the spaces between teeth and along the gumline.
By focusing brushing efforts on the cervical (near the gumline) and interproximal (between the teeth) areas, we can effectively remove plaque and prevent dental issues such as cavities and gum disease.