At your age, you should have both baby teeth as well as a few permanent teeth. This is called a “mixed dentition”.
Just as the roots of a tree hold the tree in the ground, the roots of your teeth hold your teeth in your mouth.
Avoid sugary, sticky foods or snacks, and choose nutritious foods like fruits, vegetables and cheese
Avoid drinking soda or other sugary drinks, and drink more milk & water
Avoid snacking all day long, and limit the amount of snacks you have throughout the day