這句英文有沒有錯?

Have you THOUGHT that how much

2009-03-21 17:44:13 補充：
dentifrices should be used before you every brush your tooth?

Have you THOUGHT that how much dentifrices should YOU be USING before you every brush your TEETH?

2009-03-22 10:48:23 補充：
Have you THOUGHT that how much dentifrices should YOU be USING before you every brush your TEETH?
在你刷牙之前，你有沒有想過你應該用多少牙粉。

Have you thought that how many TIMES should BE USED TO clean up your TEETH?
你有沒有想過你要用多少時間刷牙？

Have you thought that when DO you need to see the dentist ?
你有沒有想過你機長時間有去看一次牙醫？

正確no problem