Are Braces Bad For Teeth . The braces need to apply pressure to straighten your smile, so your teeth, gums, lips, and tongue all need time to get used to the new sensations. This can make the tooth less stable in the mouth and eventually lead to tooth loss. My Teeth Braces Before and After Pictures Progression from www.pinterest.com Diy teeth whitening methods, such as oil pulling, baking soda, and hydrogen peroxide, are usually safe to use when you have braces, but they could damage metal or ceramic brackets. It is much better to use different expander appliances to stimulate the mouth to grow larger, so all the teeth can fit. Braces can trap food and cause more plaque to build up than usual, so you'll need to take extra care with cleaning your teeth.