5 Orange Peel
Here is an odd one to do, but oranges do have a little acidity to them. Just take an orange peel and rub your teeth with it. It might feel a little weird, but it is a great way to counter act tartar build up. Do this before you go to bed and dont rinse, leave it, go to sleep and let it do its thing over night. The next morning, brush your teeth like normal.