It hurts to wear a traditional retainer.

It's not normal to have a particularly painful tooth. Be sure to tell the doctor that the doctor needs to adjust. There are special boxes for braces, which are sold online. If it's simpler, you can find a box of the right size. It won't deform if you don't wear it all morning, but you can't wear it for a long time. If you don't wear it for a long time, your teeth may rebound and become crooked again. As for toothpaste, toothbrush and mouthwash, there are no special requirements. Regular products can be used.