Why does my new repair look lighter than the tooth beside it?+
A tooth can dry out while being worked on, and drying affects its appearance. Give it some time, then look again, and call if the difference still concerns you.
Which light should I trust when checking the shade?+
No single light tells you everything, so looking in more than one setting is sensible. Your dentist can then evaluate the tooth with you at an examination.
Can a colour mismatch be corrected without starting over?+
Sometimes polishing or a limited repair is enough, and other times replacement is the realistic route. It depends on what is causing the difference and on the condition of the restoration.
Is staining at the edge the same as a wrong shade?+
No, although the two can look alike from a distance. Margin staining relates to the surface and edge of the restoration, so it needs a closer look to tell them apart.
Will a perfect match ever be possible?+
The goal is a believable relationship with your other teeth. Because enamel has many colours and optical properties, a perfect match is not something that can be promised.
Should I call before driving in from Lockport about the colour?+
Yes, a call to (204) 338-3003 is a sensible first step. Describe what you have noticed and ask whether an in-person review would be useful, then plan your trip into Winnipeg from there.