Explain how bacteria can enter your dentine

Constant intake of sugar dense foods affect the tooth through the decay of remains of this food particles into bacteria causing it to eat deep into the dentine which in turn could result into tooth decay and pains.

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Explanation:

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.