Do you have any idea how disgusting it is to a girl when a guy uses dip and is spitting all the time? You can be pretty sure that the first time you try to kiss a girl with that mouth, she is going to either vomit or run for the hills. Having braces is a really good excuse to quit this revolting habit before your mouth gets full of cancer.
When you dip with braces, the tobacco will cause your teeth to pull away from your gums. This would then make your teeth sensitive to hot or cold things since the tooth roots will be exposed. Consult a dentist and be advised on what t do and what not to do with braces on.
Not all girls are disgusted by it, believe me, im a girl and i dip too. Anyways, i have braces and dip, and its no big deal. Be sure to brush well everyday though to prevent your orthodontist from bitchin at you. Hope i helped.