Dr. Shweta Yadav

• Empty calorie foods such as candy (especially hard or sticky candies like lollipops, mints, taffy and caramel), sweets like cookies, cakes and muffins, and snack foods like chips are a cause for dental concern, not only because they offer no nutritional value, but because the amount and type of sugar that they contain that can adhere to teeth. The bacteria in your mouth feed off these sugars, releasing acids, and that’s what leads to tooth decay.
• Sugar-containing drinks—soda, lemonade, juice and sweetened coffee or tea (iced or hot)—are particularly harmful because sipping them causes a constant sugar bath over teeth, which promotes tooth decay. 
• Nutritious, acidic foods like tomatoes and citrus fruits can have acidic effects on tooth enamel, too, so eat them as part of a meal, not by themselves. Dried fruits, including raisins, are also good choices for a healthy diet, but since they are sticky and adhere to teeth, the plaque acids that they produce continue to harm teeth long after you stop eating them. Opt for a piece of fresh fruit instead.
• Cheese, milk, plain yogurt, calcium-fortified tofu, leafy greens, and almonds, are foods that may benefit tooth health thanks to their high amounts of calcium and other nutrients they provide. Protein-rich foods like meat, poultry, fish, milk, and eggs are the best sources of phosphorus. Both of these minerals play a critical role in dental health, by protecting and rebuilding tooth enamel.
• Fruits and vegetables are good choices for a healthy smile since they are high in water and fiber, which balance the sugars they contain and help to clean the teeth. These foods also help stimulate saliva production, which washes harmful acids and food particles away from teeth and helps neutralize acid, protecting teeth from decay. Plus, many contain vitamin C (important for healthy gums and quick healing of wounds) and vitamin A (another key nutrient in building tooth enamel).
• Hands down, water—particularly fluoridated water—is the most tooth-friendly beverage

Don't rush, when you brush: for maximum results, brush your teeth for atleast 2 to 3 minutes.