Approach notes

Summer - Hike up the main trail, until a sign designating the start of the Source Lake Overlook trail. Take this trail, which avoids losing elevation, to the valley to the south below the east face of The Tooth. There is a good climbers path with cairns to guide you. 

Winter - Hike up the main trail all the way to Source Lake, then turn south in the valley. Hike up the valley until below the east face of The Tooth. Do not follow the summer path, since there is significant avalanche danger there.