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Of the 6 planes or faces of your teeth, the 2 sides most difficult to brush are...
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2021-09-28 at 1:31 PM UTCThe top outside face, and the bottom inside face. Folks, they require proficient rotational ability from your tendons and ligaments.
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2021-09-28 at 3:18 PM UTC3 since you claimed 6 planes.
under the gums and between the teeth (hence you use tape or floss string)