Purchase a crib teething rail guard from a baby boutique, a home furnishing store or a department store. Consider which options are best suited to your needs. A plastic teething rail guard might be just as hard as the wooden surface of your crib, and might potentially hurt your baby if he falls into it. Thus, a cloth teething rail guard or a gummy teething rail guard might be better options. They will provide a smooth surface for your baby to chew on, while preventing damage to the furniture.
Secure the rail guard in place with the materials provided by the manufacturer. Ideally, these will either be Velcro or medium-length ties. Avoid longer ties, which can create a choking hazard for your baby.
Provide your baby with other teething toys to reduce his need to chew on the crib. You can buy these toys at any baby boutique, and you can freeze them before giving them to your baby to reduce the pain in his gums by numbing them. In addition, teething gels can be a useful way of numbing your baby's gums and reducing the pain of teething.