Of course, some extreme preppers will settle for nothing less than a military-grade gas mask rated for chemical, biological, and nuclear warfare. While it is true that such masks offer much better protection against nerve agents and similar extremely harmful substances, it's not a likely concern in most parts of the world - and either way, it's doubtful that you would have enough time to suit up once the symptoms kick in.

Got a car? Don't go too fast, keep a three-second distance to the vehicle in front of you, and always scan for cross traffic when approaching intersections or making turns: other drivers may be less attentive than you. Be very careful when changing lanes, do it slowly, and be sure to adjust your mirrors to eliminate blind spots (you don't really need to see the sides of your car). Slow down for cars stopped in other lanes - they may be letting a pedestrian through. Wear seat belts, keep children in fitting car seats, get some rest on longer trips, and don't talk on the phone - it doesn't matter that it's hands-free. Avoid frequent rides with people who drive badly, too.

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Of course, while this approach reduces the odds of being blindsided by a painful problem, it does not make the risk go away: a chipped tooth or a painful abscess can strike with virtually no warning. If you can't see a dentist right away, OTC painkillers can offer partial relief, but no amount of ibuprofen will let you forget about an exposed nerve. Topical benzocaine ointments may work better in some situations, but they don't last very long. Sometimes, swishing some cold water in your mouth, or sucking in air through a carefully positioned straw, can offer decent relief. In the longer haul, amoxicillin can clear up many dental infections, while zinc oxide / eugenol cement can be used for emergency repair of damaged teeth. There are some reports that repeated treatments of cavities with silver nitrate can be beneficial, too - but be aware that the substance is caustic and tends to semi-permanently stain skin (and anything else it comes into contact with).
Groceries. Try to shop at less expensive grocery stores and try out lower-shelf brands - especially when it comes to commodities such as cooking oil, paper towels, milk, seltzer water, flour, sugar, or salt. Table salt tastes and works the same, whether you paid $1 at Walmart or $15 for a Sherpa-approved Himalayan variety at Whole Foods. Groceries eat up a good chunk of our monthly budgets, so even seemingly inconsequential savings tend to add up very fast.
Some Geiger counters can keep track of the cumulative dose for you, but most will simply display the rate at which you are getting exposed - typically in microsieverts per hour (µSv/h) or microroentgens per hour (µR/h; for gamma radiation, 1 R/h ≈ 1/100 Sv/h). To figure out what the reading means, you need to do the math: for example, at 600 µSv/h, you will hit 100 mSv within a week, and 1 Sv within about two months. (The usual background rate from natural sources hovers around 0.1-0.2 µSv/h.)

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