Generally, it is seen that the age of children who visit the dentist is under six years. The main reason of there bad teeth is improper cleansing of teeth which is because of ignorance towards dental hygiene and eating carbohydrate enriched food. 

Sufficient balanced  diet fulfills the need  of necessary nutrition and minerals to teeth and gums, so that teeth and gums are strong and increase there resistant power against infection.
Forbid the habit of chewing snacks instead of this eat cheese, paneer, groundnut, popcorn, fruits, salad etc .
The main reason of bad teeth and its proper treatment:
Children mostly eat sticky and sweet things like chocolates, toffees, sweets. These things sticks above the teeth  and the germs inside the mouth dissolves the sugar of sweets in the form of acid. This acid reduces the shine of the outer layer of teeth and damages them. Thus it is necessary to brush the teeth properly and regularly so that no residues are left inside the mouth. It is not sufficient to brush the teeth in the morning only but brushing the teeth at night is more necessary than the morning. Gargle the mouth with water after eating anything you eat.

When your baby teeth breaks than the stable teeth comes at there place. But if the shape of stable teeth is different from the baby teeth than you should understand that it is the alarm of danger. If different types of teeth comes than food particles ( small particles of food) makes there place in between them. And this results in tooth cavity that is the problem of teeth.

It is very difficult to treat the tooth cavity that is big whole or hollow teeth among kids because they are often scared of injection. That is why dental anesthesia is given to them to treat there teeth.  

If teeth has deteriorated a lot and the problem has reached to root canal than don't do late and go to the tooth specialist immediately for the tooth treatment. Be careful if that teeth is baby teeth than capping is compulsory.

If there is less gap for the new teeth than a space maintainer is inserted so that there is created a space of one block for the new teeth and  the teeth does not come one above the other.

After ten years it is necessary to keep the space between the two teeth clean  and for this dental floss is brought into use.