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I've only just realised that the blue colour from my toothbrush wares away so you know when to change it : r/mildlyinteresting
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Oral-B iO Gentle Care Electric Toothbrush Head, Twisted & Angled Bristles for Deeper Plaque Removal, Pack of 4 Toothbrush Heads, Suitable for Mailbox, White : Amazon.co.uk: Health & Personal Care
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