By far the most damaging of all insects are termites, abundant in tropical regions. The damage to all paper-based materials can be catastrophic, in that entire collections can be rendered useless by the severe nature of the attack, often before an infestation problem has been recognized. There are three main types of termites: drywood, dampwood, and subterranean. Termites eat all cellulose materials, including wood, paper, binding cloth, and binding board. Some protection from termites can be given by the building design (use of metal shielding over wooden foundations, painting any exposed wood), but the best remedy is cleanliness, prevention of moisture, and constant vigilance. Termite infestations can usually only be dealt with through the use of pesticides applied by a qualified operator. There has been some success with buried traps that attract subterranean termites.