Hi.. Thanks for the query.. As per your complain braces are not a cause for constipation rather at times after wearing braces due to changing position of the teeth and also pain in moving teeth can cause improper or incomplete chewing of food leading to disturbance in digestion and absorption and all of this can cause constipation.. At times stress can be a cause for such symptoms... I would suggest you to consult your Orthodontist and get evaluated who can advise you proper diet that can be taken while wearing braces that can help in.preventing constipation.. Also try to chew your food well before swallowing.. Take more of fibres in the form of salads and green vegetables.. You can also drink warm water.. You can go moderate workout daily.. Stool softener like Docusate can help.. Avoid strwas.. Hope this helps.. Regards..,