Should I change my coffee drinking habits when using braces?

Coffee should be fine (unless you've heard otherwise from your dentist or other health care people of course!). There should be no additional concern about coffee, e.g., its acidity or temperature (other than normal caution).

There are some foods to avoid, but I don't see coffee or anything similar on any list of foods to avoid; here's a few curated lists:

• Dental Associates, a practice in Wisconsin, US
• Oral B, a manufacturer of dental products

In general, the recommendations are to avoid hard foods (e.g., crusty bread, ice cubes, popcorn) or sticky foods (e.g., gum, hard candy, caramels), and to be careful of sweets in general (which can promote tooth decay in general but can be more difficult to clean-out with braces.)

If anything, take less sugar with your coffee! Otherwise, continue to enjoy your coffee.