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Ask yourself what you have to gain by pointing out that he is wrong. If it is not much, consider not saying anything at all and saving your confrontational effort for battles that actually matter. For example, if you and your significant other alternate on who does the dishes and he says he did them last but you know he is wrong, it may not be worth an argument over such a small thing. However, if it is a repeated habit of his to not remember such that you are regularly contributing more than he is, then it is more worth bringing up. Other situations that likely aren't worth it include his being wrong about something very trivial, such as if he said something happened about four days ago when you know that it happened two days ago exactly. If it will not change the future course of the conversation in a meaningful way it is often best to let things like that go. If it is a particularly emotional issue and you find yourself having trouble thinking straight about the pros and cons in your head, make a list with a pen and paper. No one likes to lose face in front of a crowd; if you are going to tell him he is wrong, pull him aside and do it privately. This means that sometimes you will have to wait for a more opportune time; it may not always be the best decision to confront him right on the spot. If you bring up issue later once the conversation is private, be sure to frame it in a neutral way to get the conversation off to a good start. For example, rather than saying something along the lines of "hey, remember that thing you were wrong about earlier? I need to talk to you about that" or "remember that silly thing you said earlier? What is with that?" try to use more neutral language such as "hey remember that thing we were disagreeing on earlier? Can we chat about that for a minute?" Even if you have a lot to gain or even if it will feel great to tell him he is wrong, be sure to tell him with a level head. You do not want to put him on the defensive or get him upset, unless that is actually your goal, it will most likely undermine your real goal, which is to get him to see your viewpoint on the matter. Before you speak up about him being wrong, make sure that you have carefully considered the issue and know in fact that you are right. Think about what he might say in response to you to defend himself, and come up with a list of responses to his counterpoints so that you can be more likely to convince him that he is wrong, should he refuse to believe you. Think about how sure you feel that you are right, and know that there is a good chance that he feels similarly strong about his position. Remember that although you think that you are right and that he is wrong, there is a chance that you are actually the one who is wrong. As you decide whether to speak up, keep in mind that there is a chance that you are mistaken and prepare yourself to listen carefully to his counter arguments. Think about why he thinks he is right. In doing so, you will be more confident that he is in fact wrong, realize that he is right, or get a better sense of the specific issues to pinpoint when explaining to him why his is wrong. The reality is there isn't going to be a one-size-fits-all answer for the best way to tell someone they are wrong because people have different personalities that may make some approaches better than others in some cases. Sometimes the best approach will be to be friendly but other people's ego's may rebut any friendly attempt you make. Sometimes being assertive and not backing down and driving the point home will be what it will take to convince him he is wrong. For example, if he is stubborn, being passive and friendly you likely won't get through to him. In cases like this, you will may need to be more assertive and forceful. If on the other hand he is sensitive to criticism, being assertive and forceful may be particularly off-putting for him.

summary: Weigh the pros and cons. Figure out the right time. Keep calm. Be prepared. Stay open-minded. Take his perspective. Know who you're talking to.

Summarize the following:
Because white spots are also an indication of enamel damage and early stages of tooth decay or can also be produced by fluoride ingestion at an early age (childhood fluorosis), preventing these spots from forming is almost always preventable with regular brushing and flossing. Improving your dental hygiene habits will reduce the likelihood of getting white spots in the future. Some tips to help you have great oral hygiene habits include: Always brush your teeth after waking up, after eating, and before going to bed. Check the fluoride content of your toothpaste. You need enough fluoride to reduce acid and balance out your mouth's pH levels, but you don't want to have so much fluoride that it is damaging. Try to aim for amounts of fluoride between 1,000 and 1,500 ppm unless your dentist says otherwise. Floss every night. If you have difficulty using standard floss, try using a pre-threaded flosser, instead. Visit the dentist every six months. Good care at home can prevent most problems, but a dentist can diagnose early signs of plaque buildup and other related issues. Certain foods can damage tooth enamel and make the mouth acidic and dry, allowing more bacteria to grow as a result. This can damage the enamel on your teeth and allow harmful bacteria to infiltrate the pores of your teeth, leeching nutrients and minerals from the teeth and causing white spots. Some tips to reduce your intake of these products include: Avoid sugary drinks, especially carbonated drinks like soda. Also be wary of candy and products that contain artificial sweeteners. If you need to sweeten something, opt for natural alternatives like honey or maple syrup, and use as little as possible. If you do consume anything that is high in sugar or carbohydrates, be sure to rinse your mouth with water immediately, then brush after about 30 minutes. In addition to remineralizing your teeth with home remedies or in-office professional treatments, another great way to prevent white spots is to eat foods that are heavy in teeth strengthening minerals. By consuming vitamin D- and calcium-rich foods like milk, cheese, and yogurt, your teeth and body will absorb nutrients that help make your teeth strong and prevent white spots. Also look for foods that are high in magnesium, like dark leafy greens, nuts, seeds, fish, soybeans, and avocado, because magnesium helps the body absorb and retain more calcium. Staying hydrated helps your body perform at its best and it may also help prevent white spots. When your mouth is dry, the lack of saliva throws off the pH balance in your mouth and allows bacteria to grow and attack your teeth with their acid. Try to drink at least eight 8-oz (250-mL) glasses of water daily. Avoid hydrating with liquids like fruit juice, soda, or other beverages. If you do drink one of these damaging liquids, be sure to rinse your mouth with water or brush your teeth afterward. Add a few drops of lemon juice which can help promote saliva flow. Two of the most damaging substances you can introduce to your mouth are tobacco and caffeine. Caffeine is extremely acidic and damages the enamel on your teeth, allowing bacteria to enter the pores of your teeth and cause white spots and other decay. Smoking and chewing tobacco increase plaque and tartar build-up on your teeth, which can cause more damaged areas and white spot formation. Tobacco and caffeine will also stain your teeth, and any white spots you currently have will only appear more pronounced against the yellowing enamel.
summary: Practice good oral hygiene. Avoid foods and drinks that damage your teeth. Eat mineral-rich foods to remineralize teeth. Drink plenty of water. Avoid tobacco products and caffeine.