If you are just concerned with the look of the anterior (front) teeth, then you could benefit by doing some whitening followed by a combination of re-contouring and bonding. This is the most conservative way to treat your situation and can greatly improve the appearance.
It depends which tooth it is. If it is a wisdom tooth (third molar) then the answer is usually no. Any other tooth can be replaced with an implant if there is adequate bone or if the bone can be preserved. What is nice about the implant is that it is an individual tooth and does not require preparation or drilling down of the adjacent teeth. Anatomical position of the tooth also dictates if the area is able to house the implant. Structures such as the sinus and nerve canals or the width between the adjacent roots may make it difficult or impossible to receive the implant. It is best to consult with a periodontist or oral surgeon to know if you are a candidate for an implant.