Philips Sonicare Elite Rechargeable toothbrush with 2 modes HX5910 2 modes 3 brush heads 2 travel cases - Manual (Page 17)

Problem Solution
The brush head chatters
against my teeth.
This can be avoided by keeping the brush head properly
oriented, with the brush head placed on the gumline at an
angle of 30 to 40 degrees.
Brushing seems less
powerful.
The handle may need recharging.
The Easy-start feature may be on and needs to be shut off
(see chapter “Using the appliance”)
You may need to clean your brush head.
You may need to replace your brush head.
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