The aetiology of gingival recession in the healthy perio-
dontium is circumstantial and based on clinical observation
with epidemiological data [70, 71]. These data associate
recession with tooth surfaces that receive the most attention
during the brushing cycle [54, 71-74], namely the buccal
surfaces. Observing the toothbrushing cycle is far from
straight forward due to change in habit on observation.
Rugg-Gunn et al. [75] showed the brushing cycle was in
the order of about 1 min; however, the tooth surfaces did not
receive equal brushing time; the first site receiving the most
attention and the last the least [75, 76]. Recently, there has
been an increase in the use of power brushes. Interestingly,
their brush head action has not been shown to cause more