Lizards do have teeth. However, the teeth of most lizards aren't specialized the way they are in animals like carnivores or rodents. All of their teeth look like pegs and are simply for catching prey and moving them down the digestive tract.
Teiid lizards as well as Iguanas have different types of teeth. The gila monster and the Mexican beaded lizard have teeth with grooves connected to venom sacs in their lower jaw.
Some lizards have acrodont teeth, which are teeth situated on the top of their jaw. Most other lizards have pleurodont teeth. These teeth are found to the side of the animal's jaw.