A forum such as this works best as a way to get an answer to specific questions. I recommend that you tackle each of these issues one at a time and make your questions more specific by describing what part of each of these issues your are able to do so that we can see what part each process (1, 2 and 3) you are unable to do.
Starting just with #1....
You can set up a table with 2 fields, an image ID or name field and a container field into which you insert your tooth images. You can set up 3 records in this table. You can then add a corresponding image ID or name field to your main table and link it to this new table in a relationship. You can format this new field in your main table with a value list of either image ID's or Image names. You can then add the container field from this new table to your main table's layout. When you select a particular value (such as "crown") in the main table's image name field, the image from the corresponding table will appear in the container field on your layout.
thanks PhilModJunk you are a saviour.... am done with the #1 as advised will post the remaining 2 queries separately.