Overflows holes can be used in the event the sink overfills, which is a big problem if they are clogged. As you routinely look for things needing attention, check to be sure that the overflow holes are clear and unblocked. Always remember to keep your dryer's lint trap clean. This will save you trouble, such as preventing fires. Inspect your lint trap often to see if there are any tears or holes. If there are, you can have lint getting into your pipes, and this will clog them and give you more problems that will have to be dealt with. More information about Frankford Sewer Cleanouts.
The first way is to get a chisel and a hammer and try to jostle the fitting loose. If that doesn't work, you'll need to break through the plug itself. It is important to check the background of any plumbers you are looking at hiring, and get referrals if possible. An inexperienced plumber will end up being costly if they can't do the job correctly, and they cause further problems for you later. Check out online reviews of various plumbing companies, or get recommendations from friends and family. Check your toilet regularly for leaks. Try dropping a little food coloring in the tank. Keep your eye on the toilet bowl; if you notice colored water, you can safely assume that you are dealing with a leak. Know where the location of the main water-valve is on your property. You'll find a water meter right on it or near by. Sinks, toilets and other fixtures may also have their own cut-off valves.