Canker Sores (Cancrum oris-gangrenous stomatitis)

Ars. Alb

With great dryness and burning heat in mouth and tongue.

Hydrocotyle

After the abuse of chlorate of potash.

Lachesis

With dark purplish appearance of the adjacent mucus membrane.

Merc. Sol

When there is salivation and soreness.

Nit. Acid

In sharp sticking pains. It is especially indicated after over indulgence in sweets.