I think you should add to your dental listerene/mouthwash,
plain salt makes a pretty good tooth paste, clove oil or just cloves untill you have had a bad toothache its hard to apreciate these items.

making soap from wood ashes as you suggested is a good idea

[link to www.youtube.com]


There are also natural alternatives

[link to www.ask.com]

for shampoo I just use bar soap anyway