That’s a very nice design, I’d suggest reducing the dark shading on the tooth a bit to make it pop out a bit as it seems a bit dark, other than that it seems great! nice work.
It looks great, but there are some areas that needs to be fixed.
First thing and the most obvious one is… you shaded the reflective/highlight part of the tooth. It makes the tooth look menacing and dark. Here’s a reference image if you aren’t sure what I’m pointing at:
Second is the toothbrush, it doesn’t look bad, it just doesn’t fit very well with the text. You can see it blocking the text instead of elaborating with it. What I would suggest is to make room for the toothbrush in the middle, I wouldn’t suggest removing the toothbrush or placing it on the side though because the toothbrush makes the text look more distracting in a good way.
Third is to make the main focus larger, it might seem large enough but if you scale it down to the actual size of the icon, the background seems to take too much space compared to the main focus of the icon itself, just make it large enough until it looks like it pops out from the icon instead of shying away in the middle.
Fourth, this is the last one I promise. Is to point out what you want people to see, I’m focusing on the toothpaste tube and towel thing or whatever that is on the left side of the text, it’s barely noticeable if you scale it down because they are cold colors! (well except for the yellow I guess, but still) I suggest putting a white outline around it just like the text, or just change the color to something warmer like purple or something else.