Original sentence: Careful and frequent brushing with a toothbrush and the use of dental floss help to prevent build-up of plaque bacteria on the teeth.In many parts of the world natural toothbrushes are used
Edited sentence: Careful and frequent brushing with a toothbrush helps to prevent build-up of plaque bacteria on the teeth.In addition to brushing, the use of dental floss too may help to prevent build-up of plaque bacteria on the teeth.In many parts of the world Teeth cleaning twigs are used.Plants saps present within the twig make the use of additional tooth paste unneeded.Unlike tooth brushing, scrubbing can also be done using a twig.With this approach, no brush is used but the twig itself is used to clean the teeth