There are many causes of drain clogs including root intrusion in your drain pipes or outdated and broken pipes, but the most common reason for drain clogs is due to human negligence. In the kitchen, hardened grease and fat from cooking, food scraps, and small kitchen items are usually the culprit. In the bathroom, fallen hair, residue, and soap fragments are normally to blame. Toilet, bathtub and sink backups are generally caused by flushing of non-disposable items such as wipes, paper towels and feminine waste products. Just be more aware of what goes down your drains, and if a clog does appear, be careful. Although liquid drain cleaners can sometimes offer a quick fix to the problem, using them too often can cause bigger problems to your drains in the long run. To prevent any future clogs, make sure to dispose of grease and fat from cooking in the trash, fit all of your household drains with strainers or filters to catch all of those unwanted particles from going down the drain and make sure not to flush any non-disposables down the toilet.