Radical 211 meaning "teeth" (齒部) is the only one of the 214 Kangxi radicals that is composed of 15 strokes.
In the Kangxi Dictionary there are only 21 characters (out of 40 000) to be found under this radical. Evolution
Characters with Radical 211 strokes character +0 SC JP +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +13 +20
Literature
Leyi Li: "Tracing the Roots of Chinese Characters: 500 Cases". Beijing 1993,
External links Unihan Database – U+9F52 齒 radical - Chinese Text Project Ancient forms of the character and list of Unicode characters with the radical.