Cleaning and x rat in pregnancy

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I️ have a cleaning appt tom. I️ decided I️ don’t want the x rays. Currently 22weeks. My mother in law said she doesn’t recomend even going to dentist. Is she being idiotic or old fashioned . ? Why should someone not take care of their teeth ??? I’m so confused !!! Maybe it’s the old fashioned mentality ? She said she did nothing in ger time