Brick replacement (including cutout and re-laying) might cost $250 to $350 for a small area with around 1 dozen to 2 dozen bricks. Note that this type of work might have a minimum charge (for example, replacing a couple of bricks might be as expensive as replacing 10 simply to make it worth the company's while).
Mouth irritation. The irritation can be caused by: Biting your cheek, tongue, or lip; Wearing braces or another type of dental apparatus, or having a sharp, broken tooth; Chewing tobacco; Burning one's mouth from hot food or drinks; Having gum disease or other type of mouth infection
Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.