Prooooooooooooooooooooooooofreading

The danger, claims a dental specialist, [is] comes from drinking and eating acidic drinks and food.
Why it should be
The danger, claims a dental specialist, comes from drinking and eating acidic drinks and food.
Explanation : If you take away the middle sentence, then you will understand.
The danger comes from drinking and eating acidic drinks and food.
The sentence in the middle is telling you who said that, that is, it is only a additional information that will not affect the sentence structure.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


Chu recommends that people [to] wait at least an hour after eating before they brush.
Why it should be
Chu recommends that people wait at least an hour after eating before they brush.
Explanation : After recommend, we should use a noun / noun clause / gerund.
That people wait at least an hour after eating before they brush is a noun clause.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

To kick of the commemorations, I think you want to type kick off
To kick off the commemorations = to start the commemorations
Kick off comes from a football terms.

危險, 要求一名牙齒專家, [ 是] 來自喝和吃酸性飲料和食物。

為什麼它應該是

危險, 要求一名牙齒專家, 來自喝並且吃酸性飲料和食物>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 儲推薦人們[ 對] 等待至少一個小時在吃以後在他們掠過之前。

為什麼它應該是

儲推薦, 人們等待至少一個小時在吃以後在他們掠過之前。

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 對記念的反撞力,