At Stage 3 of their evolving oral health, kids brushing from ages 5-7 need effective cavity protection as they will be losing some baby teeth and their molars start to grow. Oral-B Pro-Health Stages Monsters, Inc. kids toothpaste protects against cavities with a mild gel formula. Children under 7 should use a pea-sized amount, and be sure to instruct them to use good brushing and rinsing habits for a memorable smile.