The unnecessary cleanings are the bad part, teeth aren’t supposed to be bright white, to get them that way we’re often stripping off a protective coating.
Comma splice x2.
I was legitimately going to ask what you thought needed a source till that second sentence…
'til ; as in, the abbreviation of 'until', and not a plough or a cash-drawer or a boat's rudder.
I gave someone else some sources though, feel free to keep lurking, just don’t expect any personal help
Comma splice x2.
Or if you asked questions instead of stating sentence fragments, people would probably take more time explaining things to you.
'Sentence fragments'? You may want to step away from the glass house when you lob accusations like that.