The demographics of your audience can determine this. We conduct in-depth research of the target audience and do profiling of the indicators such as income, age group, social preferences, and then target accordingly.
Similarly, determining which social media platforms benefit your dental practice requires determining where your clients usually hang out. For example, if your client base is primarily teenaged, Instagram is your best bet because Insta is heaven for teenagers. Likewise, if you deal with politically aware adults, you can connect to them better through Twitter.