Can't I just eat it?

Why do you need to use the yoghurt on a tooth brush?
You could think that perhaps just eating the yoghurt would do
equally fine? 


My own experience is that just eating it will not help toothache
go away. The trick works when you do the brushing. However
eating yoghurt has many good health implications per se but not
for toothache which is what we are looking at here.