 A 2018 review noted that toothbrushing is the most common preventive healthcare activity, but tooth and gum disease remain high, since lay people clean at most 40\% of their tooth margins at the gum line.
<fluency>  A 2018 review noted that toothbrushing is the most common preventive healthcare activity, but tooth and gum disease remain high, since lay people clean at most 40\% of their tooth margins at the gum line.
 A 2018 review noted that tooth brushing is the most common preventive healthcare activity, but tooth and gum disease remain high, since lay people clean at most 40\% of their tooth margins at the gum line.