Philips Sonicare Premium Plaque Defence Standard HX9042/17, 2 Ks, for Men, The Philips Sonicare Premium Plaque Defence Standard HX9042/17 replacement toothbrush heads help you to get the best results from your oral hygiene. Changing the heads regularly guarantees you are always cleaning your teeth as effectively as with a new brush. Characteristics: cleans teeth even in hard-to-reach places massages gums gently and improves their condition removes plaque easy to change How to use: Attach the replacement head to the appropriate brush and click into place.