imagetooth: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/imagetooth - from package: imagetooth

You may install the required package with command apt-get install {package}

Error in other languages:
imagetooth: bevel nie gevind nie
imagetooth: comandă negăsită
imagetooth: comando não encontrado
imagetooth: commande introuvable
imagetooth: command not found
imagetooth: käsku ei ole
imagetooth: không tìm thấy lệnh
imagetooth: komanda nerasta
imagetooth: Kommando nicht gefunden.
imagetooth: kommandot finns inte
imagetooth: komut yok
imagetooth: nie znaleziono polecenia
imagetooth: níor aimsíodh an t-ordú
imagetooth: no se encontró la orden
imagetooth: no s'ha trobat l'ordre
imagetooth: opdracht niet gevonden
imagetooth: parancs nem található
imagetooth: perintah tidak ditemukan
imagetooth: príkaz nenájdený
imagetooth: příkaz nenalezen
imagetooth: команда не найдена
imagetooth: командата не е открита
imagetooth: 命令找不到
imagetooth: コマンドが見つかりません