Oral-B Precision Clean Electric Toothbrush Head with CleanMaximiser Technology, Excess Plaque Remover, Pack of 12 - £21.99 @ Amazon

Easy delivery: 12 counts of Oral-B Precision Clean toothbrush head in a mailbox compatible packaging
The unique bristles brush away plaque for a superior tooth-by-tooth clean than with a regular manual toothbrush
Up to 100% more plaque removal and healthier gums vs. a regular manual toothbrush
With CleanMaximiser technology, green bristles turn yellow when it is time to replace your brush head
Dentists recommend to change brush head every 3 months for the best clean