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.
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H MI mean, can I switch "always" and "all the time" in the sentences above?Yes, that's fine.
Mister MicawberYour teeth should be clean all the time.here, 'clean'
Mister MicawberYour teeth should be cleaned twice a yearhere, 'cleaned'