What could cause holes in teeth after getting braces off?

Plaque/bacteria: It is much harder to clean with braces on - so it is not uncommon to find holes around areas with braces if oral hygiene is not maintained at a high level.

Simple tooth decay: Braces pose an obstacle to good cleaning of the teeth, so extra effort is necessary to avoid dental decay. Additionally, some patients ignore good maintenance and fail to comply with recommendations by doctor. Ill fitting braces may allow "leakage" between bands and teeth. In all of these cases, bacterial film (plaque) plus carbohydrate meal leads to acid production by bacteria and thus decay.

Decalcifications : This is a scientific word that means the calcium has been sucked out of the teeth. The cause almost always is due to improper brushing or failure to brush regularly. Plaque builds up on the teeth and produces acid which sucks the calcium out of the tooth. The teeth are then weakened and holes are left in your teeth. Talk to your dentist about icon treatment for the remaining decalcifications.

Creepy crawlies: Bacteria produce acids that damage teeth. So 1) keep teeth scrupulously clean...Ask your orthodontic specialist for oral hygiene instructions, and 2) don't eat anything hard, sticky, or chewy that would partially dislodge braces and allow bacteria to get behind the braces into the partially loosened areas. Follow these two rules, don't cheat, and you will be extremely pleased wit the result.