If you're caught, you'll get suspended, banned, and hated. Most of all, you'll be remembered for what you did. Ouch!
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One-sentence summary -- Never scam!

Some believe that it's a myth to say that wetting your lips is necessary to whistle while others swear by it. If you're having a hard time producing a whistle, try moistening your lips. Think of it as wetting your finger before you produce the sound around the rim of a glass. By wetting, we don't mean drenched. Just moisten the inside of your lips with your tongue lightly, and get back to practicing. If there's a difference, this method may work for you. Some people have better luck sucking air in than blowing it out. However, for most people, this is much, much harder. That being said, the logistics of placing your tongue and mouth are the same; give it a go if the standard method is becoming frustrating. With the front of your tongue on the back of your front teeth, move it up or down just a smidge. Does it change the tone? Does one tone seem to be closer to whistling than another? Keep adjusting the very tip of your tongue until you find that one tone you can produce, no problem. Once you find the right spot for the tip of your tongue, start experimenting with moving the middle of your tongue. This changes to air flow and will thus change your pitch. Once you find other pitches, it's just a matter of knowing which position correlates to which note. Whistling takes time to master. It might be a while before you find the right shape to make with your mouth or how much air you should blow out. Concentrate on making one flat tone before you go worrying about pitch or volume, too. Ask a few friends how they do it; you may be surprised that they all have slightly different techniques. No one's mouth is the exact same shape and size, so it makes sense that we all have to whistle slightly different ways.
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One-sentence summary -- Experiment with wetting your lips. Try sucking in instead of blowing out. Adjust the height of your tongue. Keep trying.

One way to get rid of cavity pain is to go to the dentist. Your dentist will do an exam and get x-rays of your teeth to see where any cavities or other tooth or gum problems are. Then, your dentist will suggest the best course of treatment for your cavity. The most common treatment for cavities is a filling. If the tooth is infected or abscessed, your dentist may prescribe antibiotics first to clear up any infection, which is important to avoid any further complications. If your tooth or gum aches because of a cavity, taking over-the-counter pain relievers may help reduce the pain. You can take ibuprofen (Advil), acetaminophen (Tylenol), naproxen (Aleve), or aspirin. Follow the dosage instructions on the label. Make sure not to let aspirin dissolve on the tooth or gum. This may harm your mouth and teeth. You can try numbing gels around the area of the cavity to help stop the pain temporarily. Numbing gels contain benzocaine. You should spread the gel on your gums with either your finger or a cotton swab. Make sure you don't swallow the gel. Spit out the gel left in your mouth. Read and follow the instructions on the box or tube to know the amount of gel to apply and how often you should apply the gel. Keep in mind that if your saliva flow increases after you have applied the gel, that is absolutely normal. Your tongue may also go numb for a while, so you may want to avoid talking for a while or you may bite your tongue accidentally.
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One-sentence summary -- See your dentist. Take over-the-counter medication. Try numbing gels.

First, pre-weigh a container. Next, take the weight of the container again, but this time with a specified volume of your liquid inside. Subtract the weight of the liquid-filled container from the weight of the empty container. The difference is the weight of your liquid. For example, if your container weighed 1.50 pounds with liquid in it and 1.00 pound empty, your equation would look like this: "1.50 lb - 1.00 lb = 0.50 lb." Your liquid weighs 0.50 pounds. Make sure the temperature of your liquid is noted when this weight is taken. You must compare it to water of the same temperature. Fill the same container to the same volume. Then, weigh the container and find the weight of that volume of water. You should not need to pre-weigh the container again, since you already know the weight of the empty container. Use the same formula to find the weight of the water. If the liquid-filled container weighted 1.75 pounds, the equation would look like this: "1.75 lb - 1.00 lb = 0.75 lb." In this example, the water weighs 0.75 pounds. Make sure that the water is at the exact same temperature as the liquid in question. Otherwise, results may not be accurate. Since you are dividing one weight by another, the units will cancel out. This makes specific gravity a unitless measurement. Use the ratio "Wl / Wwater" where Wl is the weight of your liquid and Wwater is the weight of water. For example, if you weighed 100 mL of acetone at 25 degrees Celsius, it would weigh 0.17314 pounds. Weighing the same volume of water at the same temperature would give you 0.22 pounds. To find the specific gravity of this acetone, you would solve 0.17314lbs/0.22lbs=0.787{\displaystyle 0.17314lbs/0.22lbs=0.787}. This is the specific gravity of acetone.
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One-sentence summary --
Obtain a weight for the liquid in question. Obtain the weight of an identical volume of water. Calculate the ratio of the liquid's weight to the weight of water.