Answer: you brush your teeth the same way every time because you want to prevent cavities , and get rid of plaque so brushing the right way everytime helps prevent those things.
Explanation:
No one likes having cavities so brushing your teeth is the most important thing in your day , Hope this helped!!!
Well if you think you can't do something then you won't try as hard as you can, and you wont reach your full potential. So ultimately you wont achieve the grades you want.