Yes, I have to for mice at work. Usually, if the teeth are not wearing down (rodents will grind their teeth, so even without a lot to chew, they usually wear them down on their own), I would check for malocclusion. Any misalignment of the teeth will cause them to not wear down. This can be passed down genetically, but doesn't have to be. I can't find a photo of healthy hamster teeth, but the insicors should meet exactly. The second post on this board show normal *squirrel* teeth allignment:
http://www.thesquirrelboard.com/forums/showthread.php?t=19827
Normal (and abnormal) rat teeth alignment:
http://www.ratfanclub.org/teeth.html
You can either us small scissors such as:
http://image.made-in-china.com/2f0j...dical-Scissors-with-TUV-CE-and-ISO-13485-.jpg
or fingernail clippers to trim teeth. I prefer fingernail clippers myself. You can stick a toothpick or other small, thin item horizontally in the hamster's mouth (like a dog biting down on a bone, or a person being given somthing to bite down on). This can be used to hold down the tongue. It is very possible to cut off, not only the togue, but also fingers and paws as rodents not tightly restrained will push their paws up near their mouth and can get caught in the scissors or clippers. You want to "scruff" the hamster, and have them in a firm enough grip that the legs move out sideways and can't be brought in near the face. This offers a walk through on scruffing:
http://www.wonderhowto.com/how-to-handle-and-restrain-mouse-for-injections-274015/view/
http://www.wonderhowto.com/how-to-handle-and-restrain-hamster-for-injections-274014/view/
Notice how the arms spread to the sides and the mouth naturally opens.
It takes a while to get it right. Just calmly keep practicing it before trying to trim the teeth.
Then just snip off the teeth so they are at a reasonable length. This usually must be done oncce every two weeks, sometimes sooner in the case of serious malocclusions.
EDIT: With teeth this small, sometimes a whole front tooth will be lost/fall out when clipping and will not grow back. This is usually fine.