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Grid Tooth Drawing: Silhouette and Shading Exercises
Learn to plot a tooth silhouette on grid squares and add simple shading. Includes steps, common mistakes, a worked example, and four practice tasks.
Free lesson
Four exercises
Worked answers
Object Drawing Lessons
Drawing a tooth on a grid helps you control proportion and placement before adding shading. This lesson uses a stylized two-root tooth silhouette as a drawing convention; it is not an anatomical model for every tooth or a claim about a specific tooth type. Each grid square represents one unit. You will plot the outline by counting squares, then shade the right side to suggest a light source from the left. The goal is a clear, recognizable tooth-shaped drawing with consistent shading, not a detailed anatomical study. All measurements are hypothetical examples; measure your own paper and pencil if you need exact sizes.
Practice materials: Printable downloads are not available for this lesson yet. Use the instructions and four exercises below.
Setting up the grid and the tooth convention
Use a square grid where each cell is the same size. For this stylized drawing template, assume each cell is 1 unit wide and 1 unit tall, and place the silhouette in a box 6 units wide and 8 units tall. The crown occupies the top 4 units and two simplified roots occupy the bottom 4 units. This two-root choice is a visual convention for the exercise; actual root count and form vary by tooth type, so the outline should not be presented as a universal tooth anatomy diagram.
Define the silhouette with simple curves: a broad rounded top, sides that curve inward at the neck, and two tapered roots. You do not need to label cusps or enamel. Keep the outline smooth and symmetrical unless your chosen style intentionally varies. Your stylized outline may vary slightly if it stays inside the grid and reads clearly as a crown with two roots.
- Count and mark a 6 by 8 unit rectangle on the grid.
- Mark the crown as the top 4 units and the roots as the bottom 4 units.
- Draw the rounded top curve across the upper 4 units.
- Draw the left and right sides, curving inward at the neck.
- Draw two tapered roots in the lower 4 units, leaving a small gap between them.
Plotting the outline square by square
Plotting by squares means you locate key points by counting cells from a corner. Start at the top-left corner of your 6 by 8 rectangle. The top curve begins about 1 unit in from the left and ends about 1 unit in from the right. The crown reaches its full 6-unit width at the widest points, which sit about 3 units down from the top of the rectangle, touching the left and right edges. Below that, the sides curve inward so the neck narrows to about 4 units wide at about 4 units down. Each root is about 1.5 units wide at the top and tapers to about 0.5 units at the bottom. The root section is centered: the left root spans from about 1.25 to 2.75 units from the left edge, the gap is about 0.5 units (from 2.75 to 3.25), and the right root spans from about 3.25 to 4.75 units from the left edge. At the tips, each root is about 0.5 units wide. The left tip (2.25–2.75) and right tip (3.25–3.75) each shift 0.5 unit inward from the center of their own root top; together they remain centered on the rectangle midpoint at 3 units, with a 0.5-unit gap between them.
Use light pencil marks first. Check that the outline stays inside the rectangle and that the roots do not cross. If a curve looks too flat, adjust by moving one or two points by half a unit. The grid is a guide, not a rigid cage; small variations are acceptable if the overall shape is balanced.
- Mark the top curve start and end points by counting squares.
- Mark the widest crown points on the left and right.
- Mark the neck points where the crown meets the roots.
- Mark the root tips and the gap between roots.
- Connect the points with smooth curves and erase extra guide marks.
Adding simple shading on the grid
Assume a light source from the upper left. Shade the right side of the crown and the right root more than the left. Use three tones: light, medium, and dark. The light tone stays on the left and top-left. The medium tone covers the right side and the lower crown. The dark tone is a narrow band along the far right edge and the right root. Keep shading inside the outline.
Shading can follow the grid squares or blend across them. For a clean look, fill each square with one tone and then soften edges with light pencil strokes. Do not shade the gap between roots. Leave a small highlight on the upper-left crown unshaded. The contrast should be clear but not harsh.
- Decide the light direction and mark the unshaded highlight area.
- Fill the left and top-left with light tone.
- Fill the right side and lower crown with medium tone.
- Add dark tone along the far right edge and right root.
- Soften edges and check that shading stays inside the outline.
Checking proportion and consistency
A good check is to compare the crown width to the root width. In this convention, the crown is about 6 units wide and the neck is about 4 units wide. The roots together are about 3.5 units wide at the top (1.5 + 0.5 + 1.5). At the tips, each root is about 0.5 units wide, so the two tips total about 1.0 unit of tip width plus a 0.5-unit gap, spanning about 1.5 units including the gap. The example tips shift inward by 0.5 unit from their individual root-top centers, while the pair remains centered overall. If your two tips total much less than 1.0 unit, adjust the outline.
Also check that the tooth is centered in the rectangle and that the shading matches the light direction. The left side should be lighter than the right. If the shading is reversed, erase and reapply. Keep your pencil marks light until the final check.
- Measure the crown width and neck width in grid units.
- Measure the root width at the top and tips.
- Check that the tooth is centered in the 6 by 8 rectangle.
- Confirm the left side is lighter than the right.
- Erase guide marks and darken the final outline.
Worked example
On a 6 by 8 unit grid, plot a tooth with a rounded crown in the top 4 units and two tapered roots in the bottom 4 units. Shade with light from the upper left using three tones. Describe the key grid points and shading zones.
Worked answer
Mark a 6 by 8 rectangle. The top curve starts 1 unit from the left and ends 1 unit from the right. The widest crown points touch the left and right edges of the rectangle about 3 units down from the top, giving a full 6-unit crown width. Below that, the sides curve inward so the neck is 4 units wide at about 4 units down. Each root is about 1.5 units wide at the top: the left root spans about 1.25 to 2.75 units from the left edge, the gap is about 0.5 units (from 2.75 to 3.25), and the right root spans about 3.25 to 4.75 units from the left edge. At the bottom, each root tapers to about 0.5 units wide. The left tip spans 2.25–2.75 and the right tip 3.25–3.75 units from the left edge; each tip center is shifted 0.5 unit inward from its own root-top center, and the two tips remain centered together at x=3 with a 0.5-unit gap. Shade the left and top-left with light tone, the right side and lower crown with medium tone, and a narrow band along the far right edge and right root with dark tone. Leave a small highlight on the upper-left crown.
Four practice exercises
Exercise 1
Plot a tooth on a 6 by 8 unit grid. The crown is the top 4 units, the neck is 4 units wide, and the two roots taper to 0.5 units each at the bottom. Describe where you place the top curve start and end, the widest crown points, and the root tips.
Show answer and check
Top curve starts 1 unit from the left and ends 1 unit from the right. Widest crown points touch the left and right edges of the rectangle about 3 units down from the top, giving a full 6-unit crown width. Below that, the sides curve inward so the neck is 4 units wide at about 4 units down. Each root is about 1.5 units wide at the top: the left root spans 1.25 to 2.75 units from the left edge, the gap is about 0.5 units (from 2.75 to 3.25), and the right root spans 3.25 to 4.75 units from the left edge. At the bottom, each root tapers to about 0.5 units wide: the left tip is 2.25–2.75 and the right tip 3.25–3.75. Each tip center is 0.5 unit inward from its root-top center (2 to 2.5 on the left, 4 to 3.5 on the right), while the pair remains centered at x=3.
Why: Counting from the rectangle corners keeps the outline centered. The neck width of 4 units leaves 1 unit on each side. The root tops span 1.25 to 4.75 units from the left edge, leaving 1.25 units of space on each side. The left root-top center is (1.25+2.75)/2=2 and its tip center is (2.25+2.75)/2=2.5; the right root-top center is (3.25+4.75)/2=4 and its tip center is (3.25+3.75)/2=3.5. Thus each tip shifts 0.5 unit inward toward the tooth centerline at x=3; neither is centered directly under its own root top. The pair stays centered overall. The tip row totals 6 units: 2.25 units of space + 0.5-unit tip + 0.5-unit gap + 0.5-unit tip + 2.25 units of space = 6.0.
Check: Measure the neck width in grid units; it should be about 4. Measure each root tip; it should be about 0.5 units wide. Confirm the left top and tip centers are 2 and 2.5, and the right top and tip centers are 4 and 3.5; each tip shifts 0.5 unit inward toward x=3. Confirm the tip row totals 6 units: 2.25 + 0.5 + 0.5 + 0.5 + 2.25 = 6.0, and confirm the tooth is centered overall.
Exercise 2
A tooth outline is 6 units wide at the crown and 5 units wide at the neck. The roots are 2 units wide total at the top and taper to 1 unit total at the tips. Is this consistent with the lesson convention? Explain one adjustment.
Show answer and check
It is not consistent with the lesson convention. The 5-unit neck is wider than the 4-unit convention and leaves only a 1-unit difference from the 6-unit crown. The roots are also too narrow at the top: the lesson uses two 1.5-unit root tops (3 units total) plus a 0.5-unit gap, while the prompt gives only 2 units total for the root tops. The 1-unit total tip width does match two 0.5-unit tips. Narrow the neck to about 4 units and widen each root top to about 1.5 units while keeping the 0.5-unit gap and 0.5-unit tips.
Why: Compare each stated dimension with the drawing convention: crown 6, neck about 4, two root tops 1.5 each with a 0.5 gap, and two 0.5-unit tips. The prompt’s tip total matches, but its neck and root-top totals do not.
Check: Check the crown-neck difference: 6−4=2 units. Check the root-top section: 1.5+0.5+1.5=3.5 units. Check the tips: 0.5+0.5=1 unit total, with the stated gap separately unshaded.
Exercise 3
You shade a tooth with light from the upper left. You apply dark tone on the left side and light tone on the right side. What is wrong, and how do you fix it without redrawing the outline?
Show answer and check
The shading is reversed. Erase the dark tone on the left and the light tone on the right. Reapply light tone on the left and top-left, medium tone on the right and lower crown, and dark tone along the far right edge and right root.
Why: With light from the upper left, the left side receives more light and should be lighter. The right side is farther from the light and should be darker.
Check: Compare the left and right sides. The left should be lighter. Check that the darkest band is on the far right edge.
Exercise 4
On a 6 by 8 unit grid, the crown occupies the top 4 units and the roots occupy the bottom 4 units. You want the roots to be 1.5 units wide each at the top with a 0.5-unit gap. How many units wide is the root section at the top, and does it fit inside the 6-unit width?
Show answer and check
The root section is 1.5 + 0.5 + 1.5 = 3.5 units wide at the top. It fits inside the 6-unit width with 1.25 units of space on each side if centered.
Why: Add the two root widths and the gap. Compare the total to the grid width. Centering leaves equal space on both sides.
Check: Add 1.5, 0.5, and 1.5 to get 3.5. Subtract from 6 to get 2.5, then divide by 2 to get 1.25 units per side.
Common mistakes
- Making the crown too wide compared with the roots. Count the grid units: keep the crown near 6 units wide and the neck near 4 units wide. Narrow the crown or widen the neck slightly.
- Drawing roots that cross or merge into one block. Leave a small gap of about 0.5 units between the roots and taper each root separately.
- Shading the left side darker than the right when the light is from the upper left. Erase the shading and reapply light tone on the left, medium on the right, and dark along the far right edge.
- Letting shading spill outside the outline. Shade in small strokes and stop at the outline. Check each square before moving on.
Self-check rubric
- Tooth outline fits inside the chosen grid rectangle and reads as a tooth with a crown and two roots.
- Crown, neck, and root widths follow the stated proportions within about 1 grid unit.
- Shading uses at least three distinct tones and matches the stated light direction.
- Shading stays inside the outline and the gap between roots is unshaded.
- Final drawing is centered and free of stray guide marks.
- Valid alternatives are accepted if proportions and shading logic remain consistent.
Questions and answers
Do I have to use exactly 6 by 8 grid units?
No. The 6 by 8 size is a hypothetical example for this lesson. You can use a different size if you keep the same proportions: the crown is about as wide as the full tooth at its widest point, the neck is narrower than the crown (about two-thirds of the crown width), and there are two tapered roots.
Can I use a different light direction?
Yes. The convention here is light from the upper left, but you can choose another direction if you shade consistently. The rubric checks that shading matches your stated light direction.
How many tones should I use?
Three tones are enough for this exercise: light, medium, and dark. You may use more if you can keep them distinct and inside the outline.
What if my tooth outline is not perfectly symmetrical?
Small differences are acceptable. The rubric allows valid alternatives as long as the tooth reads clearly, fits the grid, and the shading is consistent.