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"By making a few changes to the expression of certain molecules in the pathway, the researchers were able to induce tooth growth in normal developing chickens."
What appears to continue to be elusive to the evolutionist is the fact that mutations lead to pre-mature death, or to abnormalities that lessen the particular species functionality as set forth in it's particular genetic structure, and it's associated biochemical functionality.
If by chance some bird species had mutated way back when and successfully produced a new strain at the far limits of its normal range of characteristics, and the particular morphological change was benificial. Why do not many species within the family of birds have teeth at this point.
I just cannot buy this stuff. These people have one mind set and will, to fit their agenda/believe system, go to any extreme to accomodate their supposed theories and findings.
With humility in mind. I see little difference in this particular case and say Stanley Miller and his coharts attempting various early earth experiments to create amino acids complexes from basic raw materials in a laboratory controlled set of conditions, required cold traps etc. to extract amino acids from the mixtures after their exposure to high voltage discharges and or ultra-violet bombardment. The end result being a bucket of goo if each carefully monitored step in the control process was not carried out.
They live in a dream world.

Why do not many species within the family of birds have teeth at this point.

Well as the article stated, the chicken with the teeth did not survive, therefore, it could not have passed on those genes. While the death may or may not have been the result of having teeth, one must survive and reproduce for evolution to occur. Additionally, having teeth must have a distinct advantage if it is to be incorporated into the population. Often a perceived advantage can be a disadvantage. Teeth can be very costly- from the energy expended in production, to upkeep, to fighting off infections.

The same reason we don't have large claws is likely the same reason chickens don't have teeth- they and we don't need them. It does not provide any significant advantage.