Easy to Switch: Quick twist-and-click installation Designed to Clean: Compact design is perfect for reaching hard-to-clean areas of the mouth Safe and Effective: Quality tested and CPSIA approved for safe, effective cleaning Long-Lasting: Durable bristles last up to 3 months before each individual brush head needs to be replaced Compatibility: Compatible with Brusheez Electronic Toothbrush Set Keep your child's Brusheez electronic toothbrush working optimally with these replacement brush heads designed in colors that coordinate with your existing toothbrush set. Dentists recommend that you install a new brush head at least every 3 months or sooner if any of the following situations occur: Your brush head is tattered and worn. Your child has been sick. Your child has used the toothbrush to clean something other than his or her teeth.