I guess the most obvious way to avoid a tooth ache if you have a cavity, is to simply have the tooth fixed, or pulled. Unfortunately not everyone has dental insurance though. And not everyone can afford to have their teeth fixed, at least not for a certain period of time (for instance if they have to save up to pay for the dental fees involved). So for those of you that cannot yet afford a trip to the dentist, here are a few tips to avoid unnecessary tooth aches:
1. Avoid eating foods with a lot of sugar in them. Just about anyone with a cavity (with a few rare exceptions) should avoid eating foods with a lot of sugar, as this almost always causes a tooth ache, which may happen just about instantly, or may not happen for a few hours after eating the food. Some of the foods that you should avoid include: ice cream, candy bars, hard candy (this is one of the worst ones), cereals with a lot of sugar, and liquids that contain a lot of sugar (such as maple syrup).
2. Avoid cold weather if possible. Much like with broken bones or other similar injuries, those who have cavities in their teeth should keep their teeth as warm as possible. Cold weather is a sure way to trigger a tooth ache when you have a cavity (or cavities) in your teeth. And once the tooth ache has begun, it is almost always too late to go somewhere warmer. So it is better to just avoid being cold if at all possible. However, if you simply must go out in the cold, make the time you spend out in the cold as short as possible, since generally you have to be exposed to cold weather for a few minutes to end up triggering a tooth ache.
3. Avoid foods that are hard to chew. Due to the pressure that it puts on your teeth when you chew hard foods, you should avoid eating food that is hard to chew. Putting a lot of pressure on a tooth with a cavity will often lead to a tooth ache. Some of the common (hard to chew) foods to avoid are: beef jerky, tough steak, nuts, and raw carrots, just to name a few. Basically common sense will tell you what you should avoid for the most part, when it comes to foods that are tough to chew.
While you can avoid tooth aches by following some of the guidelines mentioned above, you can never get rid of them entirely, at least not if you have a cavity. So with that being said and done, you are always eventually going to want to find a way to make a trip to the dentist eventually for treating tooth pain, no matter what it takes. Only then can your tooth be properly fixed (or removed entirely). And until you either have the cavity fixed, or the tooth removed, you will always end up suffering from tooth aches at one point or another.
For more info: https://www.doctorabel.us/toothache.html