You cannot repurpose a Wayspot to change it to something else. But you can use help chat to submit a location edit if mydentist for example is actually in a different location. The easiest way to do this is through help chat at https://wayfarer.nianticlabs.com/new/help
There is also an in game edit menu on active wayspots. Tap the (?) then the (!) as I illustrated here: Is there a way to change the location of power spots? - #3 by cyndiepooh
I choose not to add photos or descriptions myself, because I want to be able to tell which are the imported Wayspots and it confuses me when those are added.