Flossing is very technique sensitive. It seems like it should be easy, but it is not. Have you dental therapist spend some time with you to instruct you how to floss properly. Many people will ‘dislodge’ the plaque but do not remove it. This loose plaque will tend to re-colonize in a short period of time. You may also need to use a thicker type of floss in those areas where the gap is nice and wide.