1, if there is pus, it means "periapical periodontitis", and root canal treatment should be done first.
2, do a good job of treatment, if the crown of the tooth (exposed, visible part) is stable, then it is good to make a porcelain crown (commonly known as braces) to protect it.
3. If the crown (exposed part, you can see) of the tooth is seriously damaged, you need to make a "post crown", that is, hit a nail at the root of the tooth, and then make a porcelain crown (commonly known as braces).
In short, as long as the root is still there, it is not necessary to be a healthy canine or incisor.
As for making ordinary porcelain teeth or cobalt-chromium alloy porcelain teeth, it depends on your own economic situation and aesthetic requirements.
Remember, in your case, you only need to repair the damaged teeth. Never destroy healthy teeth!