Your molars need to be cleaned on their chewing surfaces. The indentations provide a place for bacteria to grow, so allow the bristles to poke into the crevices as you brush.

To clean these surfaces, tilt your toothbrush at a 45 degree angle against your gum line. Move the brush back and forth gently. Keep the bristles angled for a 'massage' effect. Then "swish" the brush up and away from the gumline by rotating it toward the biting surfaces of the teeth.

Hold the brush almost vertical and gently move it up and down. Only the front part of the brush should be touching the tooth surface. Be careful at the gum line, gums should be 'massaged' not 'brushed'.