Mom guilt

I want a third child so bad, however how do I bring in another child into this world knowing that they will face the same issues as their siblings most likely? Is the issues a big deal? No, not exactly. My 3 year old has cavities and yes we brush her teeth as well as she does it herself. My 1 year old has a possibility of a cavity on a tooth. He also has a lip tie that they are going to keep an eye on to see if it needs to be snipped. Me and my husband don’t have the greatest teeth as our parents never took us to the dentist like we should have. Now we are trying our best to do better for us and our kids.