Drawing a cartoon mouth: some fun facts before starting sketching!
To draw a cool mouth you need to know how to sketch teeth (4), lips (5), a tongue (5) and the gum (1). Usually, an adult will have 32 teeth in his mouth including the wisdom teeth (some people have them extracted).
The teeth are disposed in a "U" shape. Very often, when someone smiles, we only see the gum near the top of the mouth. The gum in the bottom is hide by the lower lip.
Looking at the shapes of our mouth, we can see that the lips are drawn using 4 simple lines. The teeth are mostly represented by circles while the tongue is sketch with two oval shapes. These are all the basic elements you need to draw a perfect mouth!
Let's try to draw a mouth. Start by sketching an oval to give you an idea of the shape of your mouth and then draw the outline. Continue your work by drawing the lips.
Next, sketch two small lines so you can draw perfect teeth. Draw the teeth and try to make the ones in front a little bigger. Sketch the tongue and add some colors to your work.
You can always draw a mouth using a line (3) or a circle (2)(9) if you don't want to draw all the details. A realistic mouth (4) will demand more time and practice to draw it right.
Just try different style (1) (5) (7). Once you found the one that you like the most, practice and practice again until you get it done without any reference. Enjoy!