These toothbrushes have a wrong design. The fact that their surface is not completely straight creates problems in brushing, as more pressure is applied in some areas than needed and others are not brushed at all. Their size and hardness are correct, but not their durability and price. If you want my opinion, get an Oral-b Junior or Teen, depending on the child's age, and use the Sensi Clean brushes, which are much better.