Recommendation is to replace brush heads every 3 months. I do not believe anyone will get 3 months use from any (manual)brush or (electric) brush head, I NEVER have. The "reminder" bristles on my first set went white (indicating change) after ONE week. Of course I ignored this and continue to use these brush heads whilst monitoring their condition. Having said that, the Sonicare is a wonderful toothcare gizmo and I give it 10 out of 10. Brusheads though are very expensive and it remains to be seen how economical they are as I'm still on my first set. Recommend buying your spares from Amazon as Philips' prices are astronomical - in the region of £20 for two brushes!
Just ordered replacements but went for super saver as first class was £5.01. Probably due to the excessive packaging employed by Philips! Tiny brushes in a very big box with lots of plastic packaging.
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