Our 58 year old house is situated on a concrete slab. The toilet has been wobbly and leaking for some time. When we removed it to replace the seal we noticed that the concrete is crumbling around the hole in the slab. Is this an easy fix? We put on a new wax ring and it was ok for awhile but now it's wpbbly again and now the toilet is leaking between the tank and the seat. Do we need to call a plumber or is this something we can do ourselves?

you didn't tell us the condition of the flange?
toilets don't get wobbly so soon if the flange and the floor are intact.
the other leak you describe is caused by a problem with the tank to bowl bolts and/or the gasket between the tank/bowl..

The concrete is breaking down so the flange is loose. My question is, Is repairing the concrete something we can do ourselves. could the wobbling of the toilet cause the leak between the tank and bowl?

In a concrete floor, the condition of the concrete SELDOM has any bearing on the tightness of the flange or toilet. (I personally NEVER anchor the flange to a concrete floor.

please post us a photo so an intelligent response rather than a guess can be made..
chances are you can deal with this yourself but if it looks too complicated at least we can tell you a few things you do in preparation for a plumbers visit to keep costs down.

You need to cut out the concrete and embed 3/8" x 6" long Rebar then pour new concrete. Before you pour concrete attach 4 closet bolts (Top nuts are shown as Gold Color) so they are down in the concrete with nuts shown like in this drawing. Hope this helps. Imbed Rebar in the center of the slab thickness.

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