No your teeth will not rot if you don't drink two glasses of milk everyday. For goodness sakes!Lol. You do need to make sure that you get enough calcium, but calcium is in other things not just milk. Milk is good for you don't get me wrong. Maybe you could ask your mom to buy some 2% or something?
Once your teeth have formed,milk has little to no impact.Like hot said,calcium can be had through supplements.You do need calcium,not nessasarily from milk.Many foods have calcium.Broccoli,spinach and other leafy greens,almonds are also a good source.You do need calcium to prevent osteoporosis later on.You start to loose bone mass in your thirties and should get at least 1200 mg of calcium a day.