dental, dentil

Dental or dental describes something having to do with the teeth --
Good dental hygiene is very important.
Poor diet is a major cause of dental caries.

Dentil or dentil means a small rectangular block used to make part of the design near the top of a classical column on a building, or a rectangular piece making a design on molding--
This block was once a dentil on the column of a very old building.
He wants dentil crown molding in the living room.

Now that you know that, you can say --
"He tried to make dentil molding, but it looks like it needs dental work."

Note --"dentelle" ( French for lace )  means a lacy design, most commonly one tooled into a book cover, as a border --
He wants the cover in red leather, with old-fashioned dentelle decoration.