Oral-B Flexi Soft Replacement Heads PC EB20-8 heads have 29% more cleaning bristles than the previous Precision Clean toothbrush heads revealing a brighter, whiter smile. Compatible with all Oral-B handles except Pulsonic & iO. Oral-B Flexi Soft Replacement Heads PC EB20-8 surrounds each tooth to give you a complete clean for cleaner teeth and healthier gums. They also remove up to twice as much plaque as an ordinary manual toothbrush and come with dentist recommended oscillate and rotate technology for maximum cleaning. Brushing Advice Dentists recommend that you change your brush head every three months to make sure your teeth receive the most hygienic and thorough cleaning. Here are a few other tips to keep in mind: After applying toothpaste to the brush head, only switch on the toothbrush when you are holding it against your teeth, to prevent the toothpaste from spraying. Clean the chewing surfaces of your teeth slowly, taking a few seconds for each tooth. Apply the bristles lightly, letting the brush do most of the work. When you are cleaning the outside surfaces of your teeth, apply the brush horizontally and move it slowly along the gum line, staying on each tooth for a few seconds. To properly clean the inner surfaces of your teeth, move the brush slowly from tooth to tooth. Stay on the lower incisors for a little longer, where scale often forms.