BabySonic toothbrush replacement heads are perfectly designed to take care of little mouths. The tiny brush head and soft bristles are gentle on new baby teeth and sore teething gums. Suitable from birth, the BabySonic is designed to grow with your baby, offering a selection of infant-size and toddler-size replacement brush heads. Just replace the brush head to keep using the BabySonic until they turn 3! The infant replacement brush head is suitable from 0 - 18 months and has a tiny brush head for little mouths. A toddler replacement brush head suitable from 18 - 36 months is also available. Replace brush heads when they are worn or splayed, after illness, or at least every 3 months. Replacement brush heads are available from Amazon - use only BabySonic replacement brush heads from Brush-Baby. Not compatible with Brush-Baby Go-Kidz or KidzSonic Toothbrushes. Durable and hard-wearing, BPA-free and tested to EU standards. Packaging materials - PET/Cardboard - widely recycled. Product materials - ABS Plastic - recyclable. Nylon Bristles - not currently recyclable. DIRECTIONS. Always supervise your child at brushing time. Aim to brush at least twice a day, for 2 minutes. To use, wet the bristles and apply a smear of Brush-Baby toothpaste. Encourage your little one to spit toothpaste out after brushing but do not rinse. To clean, rinse the brush head with water and leave to dry. Check bristles before each use and replace toothbrush head if damaged or when bristles become worn. Toothbrush heads should be replaced minimum every 3 months and after illness, to avoid reinfection.