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Teeth they are usually white, especially those of milk. The enamel is more or less transparent and lets through the color of the dentin, the next layer that is yellowish (much yellower and thicker in adults, that is why the final teeth appear so dark when they emerge, compared to the adjacent ones that remain milk).
Mothers are often the first to notice if there is a stain, an altered change, or something that has changed the appearance of a tooth. Some spots are of no consequence, and others are incipient caries lesions that require immediate treatment.
Caries are a process of demineralization (decalcification) of the hard structures of the tooth (enamel and dentin) as a consequence of the action of bacteria that metabolize sugar in the diet.
Early onset cavities are what happen before 3 years and typically affect the upper front teeth. They usually start as a white, crescent-shaped patch on the front surface of the incisors, parallel to the gum line. These stains are demineralisations, that if they are not remineralized, they will begin to become irregular, when the bacteria have already penetrated the enamel. Then they stain orange, brown, and they spread and deepen. When we see a white spot on a tooth, it is essential to go to the dentist's office and assess whether it is a precursor lesion of caries and put the means to prevent its advance.
But not all white spots are 'dangerous'. Any process that has altered the formation of the tooth can cause a white spot, but it is the specialist who must assess what it is.
We can not only find white spots, but also dark, brown or black, for example by the continued use of iron treatments for anemia.
There are stains that come from inside the tooth, and cannot be deleted, and other that are due to causes external to the tooth. For example, 'chromogenic' stains, which are like a border that can be of different colors (brown, black, green), and are removed by professional cleaning, although it comes out again after a short time, and is due to a specific type of bacteria that, while not dangerous, affect aesthetics, especially in older children.
When we brush the child's teeth you have to raise your lip well to appreciate any changeIf we do not look, we do not see, and it may be that when we see it is too late. Let's not think that the most dangerous stains are the 'ugliest' because it is just the opposite. The mildest, the white ones, the ones that are hardly noticeable are the ones that can most possibly cause problems. If in doubt, take the child to the pediatric dentist, who is the specialist who will assess the situation.
You can read more articles similar to Causes of stains on children's teeth, in the On-Site Dental Care category.