She's probably got the same hygienist as me. Mine told me last week to keep the interdental brush on me at all times and take every opportunity to clean in the gaps.
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She reminded me of the midwives we had back in the day who used to send us home with instructions to do our pelvic floor exercises while standing at the bus stop to "save time". It was never explained where you were meant to do them if you didn't use public transport.