Designed to fit the Tickle Tooth Sonic Electric Toothbrush, these replacement heads are available in a twin pack and can be easily attached to your Sonic Toothbrush. These unique brush heads have super soft bristles to be gentle on little gums. Your little one will never want to stop brushing! Dentists recommend that these toothbrush heads be replaced every 3 months or sooner. Only to be used under adult supervision.