Toothpastes such as Colgate Sensitive® are available for people who suffer from sensitive teeth, but it may not be fit for a child with a more ambiguous condition. It's important to consult a dentist before allowing your child to use a desensitizing product, especially if he is under the age of 12.Children 6 - 18 years and adults. For children aged 6 years and over use a pea size amount of adult toothpaste. ... spit the toothpaste out - do not rinse your mouth after brushing. don't eat or swallow toothpaste.The American Academy of Pediatrics recommends using a pea-size amount of fluoride toothpaste for children ages 3 to 6. Although it should be avoided if possible, it's safe for your child to swallow this pea-sized amount of fluoride toothpaste. At this age, brushing should always be a team effort.Sensodyne can be used as everyday toothpaste, even if the pain is only occasional. Sensodyne toothpastes have been formulated to provide the benefits of everyday toothpaste, while eliminating and then preventing the recurrence of pain or discomfort of sensitivity.