Try as much as possible to exhaust the numbers of fingerprint require of you from the phone because so many people have been victims of fraudsters & those fraudsters can be someone very close to you because by the time the person is going through your phone he/she can stylishly insert his fingerprint without your notice.
Always know the fingers you have used in order to help you detect when a strange fingerprint has been added to your device should any security details come up. This will make you be on alert for change easily should the need arise.
Remove & add fingerprints at intervals as this would help you remove a print added by an intruder unknowingly.