I am very worried about my son's teeth. He is 3yo and the dentist advised to take 5 teeth out due to the decay being already into the root of the teeth. She has identified a few more with decay and little chips(holes). I'm sure there is something in his diet combined with the disease that worsens decay, but I don't know where to start, what to stop. He eats the same as his siblings who don't have any problems. He has quite a balanced diet, only eats sweets at mealtimes, drinks water mainly, brushes teeth twice a day with adult toothpaste. Please help!