Lingual brackets are metal braces which are placed behind the teeth (facing the tongue) rather than at the front. They require special training and experience to attach and tighten. Concealed braces are very appealing for those with a larger budget who wish to have the same functionality as standard braces but without the unsightly consequences. You can expect around $9,000 as the minimum cost of braces on back of teeth. The costs may be higher depending on the extent of your crooked teeth and whether any need to be pulled out.