Did you get lost making changes to your TOC and now you wish you could start over?
Deleting the TOC is two clicks away. Click the Table of Contents command, and then click Remove Table of Contents, at the bottom of the list.
Be sure to use the Remove Table of Contents command; if you manually delete the TOC, there is a possibility that hidden code might be left in your document and cause incorrect references in any future TOC that is built.
You can also return to the default settings — Heading 1, Heading 2, Heading 3 styles as Level 1, Level 2, Level 3 — by clicking Insert Table of Contents from the Table of Contents command, then clicking Options and then Reset.