When hamsters live in the wild, they will ensure their teeth are in tip-top shape by chewing on various items. Hamsters will often use pine cones to grind down their teeth so providing a wooden alternative can help with dental hygiene. Just be sure to go for untreated, unpainted wood, preferably bought in shops but be wary of bits of wood found outside which can carry parasites.
“Hamster teeth grow continuously but, in a healthy hamster, the teeth will be worn down by eating and by rubbing against each other,” says Sarah Argrave, founder of the Starlight Trust. “So it isn't necessary for them to chew wood but it can be a good source of enrichment. Nibbling and chewing release endorphins and helps keep them happy and calm. Just make sure that the wood is safe and hasn't been treated with anything potentially harmful.”