The dental formula for Dorudon atrox is .

Typical for cetaceans, the upper incisors are aligned with the cheek teeth, and, except the small I¹, separated by large diastemata containing pits into which the lower incisors fit.
The upper incisors are simple conical teeth with a single root, lacking accessory denticles, and difficult to distinguish from lower incisors.
The upper incisors are missing in most specimens and are only known from two specimens.
The upper canine is a little larger than the upper incisors, and, like them, directed slightly buccally and mesially.

P¹, only preserved in a single specimen, is the only single-rooted upper premolar.
Apparently, P¹ is conical, smaller than the remaining premolars and lacks accessory denticles.
P² is the largest upper tooth and the first in the upper row with large accessory denticles.
Like the more posterior premolars, it is buccolingually compressed and double-rooted.
It has a dominant central protocone flanked by denticles that decrease in size mesially and distally, resulting in a tooth with a triangular profile.
 P³ is similar to but slightly smaller than P², except that it has a projection on the lingual side which is the remnant of a third root.
In P⁴, smaller than P2–3, the larger distal root is formed by the fusion of two roots.

The upper molars extend onto the zygomatic arch and are considerably smaller than their neighbouring premolars.
Like P⁴, their distal root is wider than the mesial and formed by the fusion of two roots.
The profiles of the molars are more rounded than those of the premolars.

Similar to the upper incisors, the lower incisors are simple conical teeth curved distally and aligned with the cheek teeth.
 I₁, the smallest tooth, is sitting on the anteriormost portion of the dentary, with its alveolus left open towards the mandibular symphysis and located as close to the alveolus of I₂ as it can.
I₂, I₃, and C₁ are very similar, considerably larger than I₁.
The lower premolars are double-rooted, buccolingually compressed teeth, except the deciduous P₁ which is single-rooted.
 P₃ is the second largest cheek tooth, P₄ the largest; both are very similar, dominated by the central cusp.

In the lower molars the accessory denticles on the mesial edges are replaced by a deep groove called the reentrant groove.
The apical cusp is the primitive protoconid.
M₂ and M₃ are morphologically very similar.
M₃ is sitting high on the ascending mandibular ramus.
The dental formula for Dorudon atrox is .
Typical for cetaceans, the upper incisors are aligned with the cheek teeth, and, except the small I¹, separated by large diastemata containing pits into which the lower incisors fit. The upper incisors are simple conical teeth with a single root, lacking accessory denticles, and difficult to distinguish from lower incisors. The upper incisors are missing in most specimens and are only known from two specimens. The upper canine is a little larger than the upper incisors, and, like them, directed slightly buccally and mesially.
P¹, only preserved in a single specimen, is the only single-rooted upper premolar. Apparently, P¹ is conical, smaller than the remaining premolars and lacks accessory denticles. P² is the largest upper tooth and the first in the upper row with large accessory denticles. Like the more posterior premolars, it is buccolingually compressed and double-rooted. It has a dominant central protocone flanked by denticles that decrease in size mesially and distally, resulting in a tooth with a triangular profile.  P³ is similar to but slightly smaller than P², except that it has a projection on the lingual side which is the remnant of a third root. In P⁴, smaller than P2–3, the larger distal root is formed by the fusion of two roots.
The upper molars extend onto the zygomatic arch and are considerably smaller than their neighbouring premolars. Like P⁴, their distal root is wider than the mesial and formed by the fusion of two roots. The profiles of the molars are more rounded than those of the premolars.
Similar to the upper incisors, the lower incisors are simple conical teeth curved distally and aligned with the cheek teeth.  I₁, the smallest tooth, is sitting on the anteriormost portion of the dentary, with its alveolus left open towards the mandibular symphysis and located as close to the alveolus of I₂ as it can. I₂, I₃, and C₁ are very similar, considerably larger than I₁.
The lower premolars are double-rooted, buccolingually compressed teeth, except the deciduous P₁ which is single-rooted.  P₃ is the second largest cheek tooth, P₄ the largest; both are very similar, dominated by the central cusp.
In the lower molars the accessory denticles on the mesial edges are replaced by a deep groove called the reentrant groove. The apical cusp is the primitive protoconid. M₂ and M₃ are morphologically very similar. M₃ is sitting high on the ascending mandibular ramus.
Dorudon