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1) Your teeth must/shoud be clean all the time.
2) Your teeth must/should be clean any time.

In 1)&2), clean is used as adjective.

But if I use clean as a verb,

Can I say like this?
3) Your teeth must/shoud be cleaned all the time/any time.
or 4) Your teeth must/shoud always be cleaned.

But, if I use clean as a verb, I feel like it sounds you have to clean your teeth every after you eat or drink something.
So, I think slightly the meaning is different.

5) Your teeth must/should always be kept clean.
6) Your teeth always must/should be kept clean.

Do they sound to have the same meaning?
If not, can you tell me what kinds of nuances are different?

Thank you in advance,
M
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Comments  
Hello, H M—and welcome to English Forums.

These sound correct and natural:

Your teeth should be clean all the time.
Your teeth should be cleaned twice a year
Your teeth should be brushed twice a day.
Your teeth should always be kept clean.

The others are odd or wrong.
Hello Micawber,

Thnaks a lot for your reply!
I really appreciate your help!

I understand but can I ask one more thing?
You mean, if I use "must", the sentences sound odd?
Only "should" sounds natural??

Thank you!

M
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Yes, 'must' sounds a bit strong to me. We may treat our own teeth however we wish.
I got it. Thanks a lot for your quick reply!
Good morning,

How are you today?

BTW,
I have one more question...about adverbs.

Can I say:
Your teeth should always be clean.
Your teeth sould be kept clean all the time.

I mean, can I switch "always" and "all the time" in the sentences above?

Thank you in advance,

M
Students: Are you brave enough to let our tutors analyse your pronunciation?
H MI mean, can I switch "always" and "all the time" in the sentences above?
Yes, that's fine.
Thank you very much!!!
Hello, Mister Micawber
Mister MicawberYour teeth should be clean all the time.
here, 'clean'
Mister MicawberYour teeth should be cleaned twice a year
here, 'cleaned'
I am confused. Could You please explain me that why this is happened?
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