When the rat is restrained, you should be able to gently lift his upper lip with your finger to observe his incisors. [substeps] The simplest way to restrain a rat is by holding him firmly around the torso with two hands.
[header] How to know if your rat's teeth are too long [title] Restrain your rat. [step] Your rat will not want to hold still while you look at his teeth, so it's important to make sure he is properly restrained. Ideally, you should have a second person hold the rat while you examine his teeth.