One of the worst things to happen is a sewer line clog. This is not only gross and inconvenient, but the cost of fixing it is really high. The worst thing about this problem is that it typically can be prevented if you know how. Here are some of the usual culprits of a sewer line clog:
Grease all too well known to be bad for drains. Grease should never ever go into the drain or be washed down the sink even if it is in liquid form because when it gets cooler, it will solidify and clog the sewer line. The best way to get rid of grease is to put liquid in an old can and then throw away when it hardens.
Food often gets down the drain when you are cleaning up after dinner or a meal. Using a strainer over the drain is the best idea because you can stop all of the little pieces from getting down there.
Be careful what kind of soap that you use because sometimes it can cause buildup.
All of these things can be prevented if you are careful. A little extra time paying attention to what's going down the drain will save you a lot of time and money in the long run.