Sparkles Tooth Crystal Kit Care Instructions: You can brush teeth as normal, it will last longer brushing teeth with electric toothbrush. Use your tongue to feel if crystal is still there, if unsure. If there is any glue residue after application brush your teeth to remove it. The more careful you are the longer it will last. You can eat and drink as normal. Why not mix it up - you can add as many crystals as you like and with 2 colours to choose from, mixing it is easy.