Mouth sticky in the afternoon serious may be related to hot weather, eat sweets, indigestion and periodontal abscess and other reasons. 1. Hot weather: generally in the afternoon at 1 to 4 o’clock, is the highest temperature, if you have been in the high temperature, in the afternoon may be more obvious oral dryness, the mouth will feel sticky when there is not enough moisture, and compared to the morning more. 2. Eat sweets: If you continue to eat sweets in the morning or at noon, because the sweets themselves are sticky, food residue accumulation in the mouth, you can feel sticky mouth, and more serious in the afternoon. 3. Indigestion: If breakfast and lunch are not fully digested and stagnate in the gastrointestinal tract, and food reflux is aggravated in the afternoon as the accumulation of food increases, this can lead to a sticky feeling in the mouth also aggravated. 4. Periodontal abscess: when periodontal abscess develops to a certain extent, in the teeth of the lip and cheek side or tongue and palate side will produce abscess, if the abscess breaks down, so that purulent secretions flow into the mouth, you will feel sticky mouth. If the sticky mouth is serious in the afternoon, it is recommended to go to the hospital in time to find out the cause so as not to delay the treatment.