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Some dogs like to tug, and that can actually be a good way to look at their teeth, if they are focussed enough on tugging that they will allow you to use another toy (not your finger) to push the lips up to look in the mouth. Above all, be safe. If the mouth is uncomfortable, there may be no option aside from sedation. We don't want anyone to get bitten, or the dog to be made painful by harsh manipulations.
It is incredibly important to teach your pets to accept handling of all body parts - though that may be easier said than done. Find something that your pet loves, and pair that with touching near areas that they don't want handled. Note that I said 'near'!
Suppose your dog loves chicken, but hates having the mouth touched. Feed chicken while massaging the nearest part to the mouth that the dog likes having handled. Gradually move closer, ensuring that the dog stays relaxed and eating. A similar approach can be used for handling feet or ears. These sessions must be short - just a minute at the most.
Hope this helps.