med-dental: 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/med-dental - from package: med-dental

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

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