Tree roots are dangerous to the wellbeing of your plumbing. More specifically your home’s sewage pipes. When pipes are clogged by tree roots, they physically cannot be taken care of without excavation. The congestion created is unlike any other clog just because it is so strong (have you ever tried to pull a tree root out?) . Not to mention, tree roots in plumbing cause more issues when left alone, you could suffer flooding or sewage backup. All issues that will be resolved with excavation. For more information about how tree roots impact your plumbing check this out.