You have indicated that some of the enamel is lost on your front teeth. The first step is to check with your orthodontist to make sure that the addition of bonding material will not affect his treatment. Generally speaking (and I say this without the benefit of having seen you), I see no reason why you should not be able to have some bonding placed on these teeth for protection and aesthetics. You will probably need to have the bonding replaced, perhaps with porcelain veneers after braces. So you should plan for this as well. Hope this helps.