Hey Aryo, looking at this for a few hours... I think the font is too heavy for EXCELL in #37 #38 #41 #42 and #43 He'll want something a little more subtle, not as bold.
Even though the tooth will be redesigned, this will make it stand out more so you can see any detail.
btw - the shape of the top (crown) of the tooth (gray color) in #40 is perfect. I like how high it extends above the other text. When we're redesigning the tooth for the other look (#43) we should use that height for the top (crown) of the tooth and the bottom (root).
I think if the root extends below the text it will look more like an X.
It's just an idea... if it looks good and works, great!
When doing the revision for #95, you can do one that's just as described, and maybe even take a more stylistic approach to the roots with a curve like a script font?? Just an idea..