Eh mine tell me that all the time. If it's not a bother, I say "I'll keep an eye on that" and check again in 6 months.
Let me tell you my recent "I'll keep an eye on that" crown story. DW and I planned a fairly long (10 week) trip around Europe this past fall. In preparation I had my periodic teeth cleaning and dental check up about 10 days before leaving. During the check up the dentist found an area of decay near the base of a crown. He recommended going after the decay and replacing the crown. With my tight schedule he would only have time to put on a temporary which would have to last the whole trip. Even though the tooth felt fine, there was also the risk that when opening up these old crowns I'd need a root canal as well.
I didn't have the time to deal with all that, the tooth felt fine so I decided to risk putting off the work until after the trip. After all the tooth felt fine and only needed to last another 12 weeks.
It lasted 6.
Somewhere in Belgium I started to notice the old familiar twinge.
Somewhere in Germany it became pretty obvious that I'd have to deal with it right away.
So holed up in a hotel in Augsburg I called around and found a dentist who'd see me on short notice. 2 minutes examination in the chair and she told I would need "nerve treatment" (aka root canal). Then jab, drill, ream, DONE - 10 minute root canal. 600 Euro out the door.
And everything was fine. The dentist was very professional (albeit somewhat more abrupt and less dependent on fancy equipment than her American colleagues). Two days later I was cycling along the Danube and the tooth remained pain free for the remaining 6 weeks of the trip.
Upon my return I went to my regular dentist for the decay removal and crown replacement. It was uneventful and (though a bit horrified by my story) he was impressed with the quality of the German dental work.
So everything worked out fine, but having to seek out dental work in a foreign country was a bit stressful for a few days. Henceforth I might be more inclined to listen to my dentist's advice if he recommends treatment prior to travel.