With these toothbrush bundles, you get both a Philips Sonicare toothbrush and 8 to 10 extra brush attachments. That's enough attachments to brush your teeth for about 2.5 years, since we recommend you replace the Philips Sonicare brush attachments after about 3 months. After this time, the bristles are worn, so your brushing becomes less effective. Do you want a Philips toothbrush for yourself and for your partner, housemate, or family member? Choose an electric toothbrush duo pack.