Limitations of Flossing:
Overhanged fillings and crowns margins

Concave root surfaces:
- Stretched floss can only apply to flat
or convex not concave surfaces

Limitations of Brushing:
Brush bristles cannot:

- Get in between teeth
- Get under the overhanged fillings and crown margins

Limitations of Brush user:
- Cannot tell when teeth are clean
- Over brushing may cause tooth abrasion

- Tight spacing between teeth