tootbrush useful life

[trans09]

For how long has a brush been in use that would reduce its plaque removing ability up to 30 per cent than new one?

[bigveg]

if the toothbrusher was perched upon a reversing cow for the duration of the experiment, from when toothbrush was new, then it would be an additional 30% more rubbish, making it 39% less effective than a new toothbrush on a non-reversing-cow platform. so about a month i'd say.

[brachiopod]

Is that a calender month, lunar month or Euro month, bigveg?

It also depends on the size of the removal van the plaque are driving.

[bigveg]

lunar. definitely.

interesting point about the vans. adds another layer of complexity