I still think that Oral-B makes it far too difficult for the average user to come to an informed choice of toothbrush head when, with just a few exceptions, they all claim to do everything.

Whilst over the years I have conducted a number of tests and made observations on how well each cleaned, I have not chosen to conduct any tests that really analyse in detail as you suggest. My wife’s teeth and gums have given her problems throughout her life so choice of brush head is very important to her. Existing brush heads from Oral-B are not compatible with the iO and the iO brush heads do not fit to or work with other Oral-B toothbrushes.The coloured rings have been dropped with the iO Series, but instead, each head has 1 of 12 different icons printed on it, so you can identify which one you own. The colour of the bristles start off fuller and darker, but as time passes they become lighter and appear more worn. I am slowly coming round to the view that the best option would be to think in terms of a combination of 2 (or more!

Yellow in colour, a third of the way down they have a blue banding around them, which is slightly thicker and gives strength to the bristle.It would be better if you picked up the Seni UltraThin head as that is softer and more gentle on the teeth and gums. You can really take advantage of this feature if you wish to achieve certain oral hygiene goals, if your needs change over time or if you share a toothbrush handle with someone else. Oral-B make many claims about the efficiency of plaque removal and how well each head cleans in combination with their brush handles. This is what Oral-B refers to as its “most advanced” brush head, with angled bristles that have been designed to reach deep between teeth to offer much better cleaning than a regular manual toothbrush.