A lot of electrical appliances such as hair dryers have been ruined by trying to run them on a razor plug. The problem is the razor plug has a transformer in it which reduces the electricity down to around 20 watts. Your hair dryer needs a much higher wattage as does most modern appliances. Due to the size of the transformers in these razor plugs the box needed to be fairly large. If you plan to remove the razor plug you need to decide how to fill the double wide box. Some people install two duplex receptacles in the box but this is awkward and overkill as you never need more than two receptacles to plug into in the bathroom. The best approach is to buy a replacement receptacle specifically designed for this purpose. Most hardware stores have a replacement kit available. Remember electricity is dangerous so if you are not confident and knowledgeable on the subject you should hire an electrician for your electrical needs.