They are also highly recommended for elderly and people with arthritis and hand problems.
The ultrasonic ones also help a bit better with detaching the plaque from your teeth.
clean between the teeth, so the interproximal plaque and food that gets
stuck between the teeth needs to be cleaned by floss, I would say after
each meal, because those plaques and food debris that are stuck between the
teeth can get used by micro organisms and cause interproximal cavities on
teeth and gingival damage on the gums.
While flossing it's important to lean the floss against the teeth so it
doesn't cut the gum in the middle.