Concept:This sentence follows the zero conditional pattern, which is used for general truths, habits, or repeated results.
Explanation:In a zero conditional, both the if-clause and the main clause use the present simple tense.
The if-clause is "If you don’t brush your teeth."
So the main clause must also use the present simple form: "you get cavities."
The option "had got" is past perfect and does not fit this general truth.
The option "would get" is conditional and suggests an imaginary situation.
The option "will get" can refer to a future result, but it is not the standard zero conditional form.
Therefore, the grammatically correct and natural choice is "get."
Answer:The correct answer is B. get.