Talk to your dentist immediately about any changes you notice in your mouth. Be it sudden increased sensitivity to cold, a dull ache or an odd spot that won't go away on its own, your dentist knows the difference between a simple issue with teeth and major underlying health issues. Call right away to report any such problems.
Visit your dentist regularly. Many people are afraid of dentists. For the sake of your dental health, you should try your best to conquer this fear. Don't just visit your dentist when a problem arises. If you are able, try to schedule regular tooth cleanings. Regular cleanings and checkups can prevent a real problem from occurring.
If you have a small cavity, it is always best to go ahead and fill it. Small cavities are easy to fill, while large cavities take longer, cost more and can require extensive work like crowns or root canals. It is always better to catch a cavity when it is small and the work is minimal.