A friend of mine is asking me about severity of the problem she has with the drain pipe under her kitchen faucet. The pipe was installed horizontally, but now for some reason (I suspect the main drain pipe behind the wall was moved) it is at wrong angle, down from the horizontal by several centimeters.
What are the consequences of keeping it this way for a prolonged period of time?
P.S. Sorry about my English, please tell me in comments if there are any unclear/wrong wording. Thanks.