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Use of tooth paste is not recommended in infants and children until 3 years of age. Use of tooth paste should be started after 3 years of age. However, the amount must not be bigger than a lentil in size, and therefore, it must not be 3 to 5 cm in length on tooth brush as we see on commercials.
Any of the fluoride tooth paste can be preferred when use of tooth paste is started. The important thing is that children like the taste of tooth paste and be willing to brush teeth.