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1.It also says the technology speeds up a natural process of tooth repair.
speed up加速
Action had been taken to speed up the release of cheques.
已经采取行动加速支票的发放。
2.This process is called re-mineralization. But it is too slow to stop bacteria from building up in small, narrow areas of the enamel.
build up积累
Deposits of plaque build up between the tooth and the gum.
牙齿和牙龈之间会滋生牙斑。
3.And they are quick to note that regular cleaning with fluoride toothpaste helps prevent cavities in the first place.
in the first place原先；起初
I don't think we should have been there in the first place.
我认为我们从一开始就不该在那儿。
