Do you have sensitive or soft teeth? Do you get cavities a lot? Could definitely be your diet. The foods and drink you eat daily affect how long you will keep your teeth. The bacteria in your mouth love acidic, dry, carbohydrate filled environments! Basically the more we eat those kinds of foods all day, our natural saliva can't cope with the acid change on the teeth. Ways to protect your teeth include: Drinking lots of water to neutralize acid, limit time consuming acidic items, chew sugarless gum, brush and floss 30 minutes after to avoid heavy plaque and damage causing acid, and regular dental visits.
Here are two charts provided to help you avoid destruction of your teeth.