Ballet flats really are a particular shoe style inspired by the footwear used by ballerinas. By design these shoes are really minimalist. They do very little to the foot biomechanics other than cover it and come in a wide array of good looking designs. In addition they are likely to be rather snug fitting to help the footwear stay on the feet. There isn't anything basically wrong with these types of shoes so long as they are generally fitted correctly and are also of the right size for the user.
The difficulty with these minimal types of footwear is if you have a foot issue that has to have some sort of arch support, even over a short-term basis. The main sorts of problems that this can be necessary are specifically should you be standing on your feet all day and the feet and legs become very fatigued. As a consequence of the minimal nature with the style and the usually snug fitting of the shoes, there is not likely to be a lot of room inside the footwear to try and do a lot. Medically, alternatives or solutions may be restricted for those who spend much of your time in this sort of footwear. There is simply no way that the standard foot orthotic is going to fit into these types of shoe. At times a trimmed down foot support could probably easily fit in the footwear. In other cases the issue can be taken care of by changing to a different kind of footwear that foot supports can easily be utilized in for a period of period up until the condition gets better. It is always best to go to a podiatrist and speak about the options which you have if you actually do need some kind of support and if it could be accommodated with your ballet flats style of shoes.
You will find a very limited number of ballet flats that you can purchase which do already have arch support type patterns constructed into the footwear. Having said that, they can be difficult to find and may not be suited to you. You can find the instant arches varieties of self adhesive padding that could be placed in the shoe to make some kind of support and this is often a reasonable solution if that is what is needed to deal with the issue. Podiatrists do employ them occasionally if you have few other more suitable options for you to get arch support right into a ballet flat kind of shoe.