I believe we are not unfamiliar with fluorine, which can effectively prevent tooth decay, but if the dosage is too much, it will cause fluorosis and affect the development of teeth, so we must consult a professional dentist for the dosage of fluorine in children. Should children brush their teeth with fluoride toothpaste or not? There has been a controversy about whether children can use fluoride toothpaste, and there is no definite guidance from an authority in our country, but the American Dental Association (ADA) has clear guidance on this, which is summarized below for your reference: children under 3 years old should brush their teeth immediately after the teeth erupt, and use fluoride toothpaste (but be sure to control the amount of fluoride toothpaste). For children under 3 years old, brush their teeth as soon as they erupt and use fluoride toothpaste (but be sure to control the amount of fluoride toothpaste used, about 0.1 mg of fluoride twice a day, about the size of a grain of rice, twice a day or as prescribed by the doctor). If parents are still unsure about the amount of toothpaste to use, they can consult a professional pediatric dentist to ensure that the fluoride is within the safe dosage! Warm tip: If parents are really worried about fluoride overdose, for small children under 3 years old, you can use toothpaste that does not contain fluoride, but insist on brushing the right way (history article on how to brush your child’s teeth correctly), at least once a day in the morning and once a day in the evening, and insist on flossing once a day. Also go to the oral surgeon regularly to apply fluoride protective varnish (generally once every 3-6 months) so as to reduce the chance of caries. After the child is 3 years old and can master swallowing well, you can use fluoride toothpaste, but make sure to control the dosage and prevent swallowing!