This kind of customers can't think that they haven't come for maintenance for a long time, so they should also do a good job of maintenance at ordinary times. The content of short messages can be interesting local news and weather information, and it is enough to remind nurses once a week. Extending from the weather to the back of skin care, reminding customers that it is time for care. An old customer who hasn't been to the store for a long time can send her an invitation. ...