A methodical approach should be adopted so that all the surfaces of all the teeth are brushed. It is, however, best to use a simply designed or slightly angulated toothbrush. A brush with a head approximately 2.5 cm in length is ideal for use in an average adult. Replace the toothbrush in about 4 to 6 weeks. It is the disease of the hard parts of the teeth, leading to their disintegration.
Bacteria are normally present in the mouth.
Holes occurs most frequently in the recessed areas of the teeth where two adjoining teeth meet, in the natural fissures on the chewing surfaces of the back teeth, and on the surface of the teeth next to the gum. These are the areas from where the brush can not remove the 'plaque' of bacteria. The simple answer is no. The film of bacteria known as the 'plaque' reforms so quickly after brushing, that you would have to clean the teeth perfectly, including 'the hidden areas' every hour or so to be 'plaque free'. And this is clearly impractical.