Problem: Article: Fluoride can help your baby’s teeth before they grow in.  In general, fluoride helps make your baby’s enamel strong.  Most cities and municipalities put fluoride into the drinking water.  If the water you drink contains fluoride, you’re in luck and do not have to do anything extra.  If the drinking water where you live doesn’t contain fluoride, talk to your doctor or dentist about adding fluoride to your baby’s diet.  To check if fluoride is included in your drinking water, you can check your city or municipality website, or call directly and ask. If you live in a remote area where your water comes from a well, it will not be treated with fluoride unless you have installed a system which does that for you. However, fluoride is present in most water naturally to some degree, so you should have your well water tested to determine the amount present. Before your baby’s first teeth come in, and while your baby is teething, you should wipe your baby’s gums with a clean, damp cloth every day.  Wrap the cloth around your index finger, and use your finger to carefully wipe all your baby’s gums. You can also choose to use a small and gentle infant toothbrush directly on the gums if you prefer.  Do not use toothpaste.  Use only water. Once your baby’s first tooth appears, start brushing your baby's teeth once a day.  At this stage you’ll only need to use a tiny amount of toothpaste (about the size of a grain of rice) and water.  Use fluoride toothpaste made specifically for infants or children when brushing your baby’s teeth.  Look for fluoride toothpaste that has the American Dental Association’s (ADA) or Canadian Dental Association’s (CDA) seal of acceptance somewhere on the package. Continue to wipe your baby’s gums in-between where teeth are growing. Once your baby has teeth that are located side-by-side and are touching, you can start to floss your baby's teeth regularly. One of the easiest ways to brush your baby’s teeth is to have your baby sit on your lap facing forward.  Your baby’s head can then rest back against your chest.  This puts you in the same position as if you were brushing your own teeth, which will make the process a lot easier.  Brush your baby’s teeth using small circles. Once your baby gets too big to sit on your lap, have your child stand in front of you (on a stool if required).  Your child’s head should be tilted up slightly so you can easily see all her teeth. While it may be convenient, you should not put your baby to bed with a bottle and allow him to fall asleep with it.  The sugar from the milk or juice in the bottle can harm your baby’s enamel.  This is also referred to as bottle mouth. A sure sign of bottle mouth is when your baby’s front teeth are pocked, pitted, or discoloured. Unfortunately if a severe case of bottle mouth develops, teeth may need to be removed before they fall out naturally. On the whole, it's best not to put juice in a bottle at any time, and to limit juice given to babies. In general, you can wait to take your baby to the dentist either at one year old, or when the first tooth has grown in, whichever happens first.  Your dentist will then be able to show you preventative care tips to ensure your baby’s mouth and teeth stay strong and healthy for life.
Summary: Check whether fluoride is in your water supply. Wipe your baby’s gums every day. Brush teeth daily with an infant toothbrush. Floss between your baby’s teeth. Learn the best techniques for brushing your baby’s teeth. Remove bottles from your baby’s mouth when falling asleep. Take your baby to the dentist once the first tooth has grown in.

Problem: Article: This is a common numismatic saying that means you should learn about a coin before spending money on it. Consult current pricing guides, like the printed Handbook of United States Coins or the web-based Professional Coin Grading Service, before committing to any purchases. These will allow you to find and compare the current market price of different coins and grades.  For foreign coins, look at nation-specific guides and databases like Numista. For ancient coins, consult specialty books like Ancient Coin Collecting. If a deal sounds too good to be true, it probably is. If a coin is underpriced, check to make sure it’s real and hasn’t been buffed or polished to hide faults. If you found it at a garage sale, flea market, or similar establishment, the seller may not know the actual value of their merchandise, but specialty sellers and collectors certainly do. Coins are graded differently depending on the country and individual appraiser, but a good starting place is the Official A.N.A. Grading System for United States Coins. Here, coins are ranked on a scale from 0 to 70, with extra points being given to uncirculated coins. Letters are added to denote quality, like MS for Mint State or VG for Very Good. In this system, the highest quality coin is listed as MS-70.  In general, US appraisers are more lenient than UK ones, so be aware that a perfect coin in one country may be considered flawed in another. Some people overgrade their own coins to make them more market friendly. To avoid being conned, make sure to double-check all coins using an official “by the book” standard. Remember that grading, even by a professional service, is subjective and that grading standards change over time. For serious collectors, purchase both a low powered and a high powered magnifying glass. This will allow you to look for small imperfections and signs of forgery, like coins with incorrect fonts or askew visual elements. Pay close attention to shiny coins, as details may have been buffed away to appear glossier. A portable electronic scale is an important investment for collectors making expensive purchases. Weighing a coin and comparing it to collecting guides can help you spot counterfeits made from cheaper materials. Additionally, weighing a coin can help you figure out its melt value, or how much it would go for if melted down into its raw materials.
Summary:
Buy the book before the coin. Avoid underpriced coins from professional sellers. Learn how coins are graded. Buy a magnifying glass. Buy a scale.