No, they can be used for daily plaque control on healthy or inflamed gums in conjunction with your normal toothbrush. They are also an excellent aid for those who wear orthodontic wires or teeth that are splinted (wired together) for orthodontic retention or for periodontal support, because they clean between the teeth under the wires where it is hard to get floss. Implants need special care, as do bridges. Plastic coated interdental brushes are very good for these areas as they can clean around the artifical teeth without damaging them, and are quick and easy to use. Floss needs an awkward floss threader to use around bridges and splinted teeth.